21 results on '"Yangui, Ahmed"'
Search Results
2. Opinions and Perceptions on Sustainable Weed Management: A Comparison between Greek and Tunisian Farmers †.
- Author
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Michalis, Efstratios, Yangui, Ahmed, Ragkos, Athanasios, Kharrat, Mohamed, and Chachalis, Dimosthenis
- Subjects
- *
WEED control , *HERBICIDE resistance , *FARMERS , *TUNISIANS , *HERBICIDES , *DECISION making , *QUESTIONNAIRES - Abstract
Societal awareness, demand for innovative food systems and increasing herbicide resistance have induced policy, regulatory and research actions towards the adoption of sustainable weed management, which is based on sustainable, integrated and ecological principles. The study investigates farmers' perceptions with regard to sustainable weed management, considering that the adoption of relevant practices depends on a set of farmer-specific and innovation-specific attributes. To achieve this purpose, an on-site survey was conducted in Greece and Tunisia based on a structured questionnaire, which was completed by 105 arable farmers in total. The questionnaire was designed to record farmers' opinions and preferences regarding aspects related to sustainable weed management, such as innovation and the decision making process. Using descriptive statistics methods, the study pinpointed significant differences between the responses of Greek and Tunisian farmers due to their particular needs and characteristics, suggesting thus the integration of targeted approaches towards the expansion of sustainable weed management. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Trade-Off between Land Use Pattern and Technical Efficiency Performance: Evidence from Arable Crop Farming in Tunisia
- Author
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Guesmi, Bouali, primary, Yangui, Ahmed, additional, Taghouti, Ibtissem, additional, and Gil, José Maria, additional
- Published
- 2022
- Full Text
- View/download PDF
4. Trade-off between land use pattern and technical efficiency performance: evidence from arable crop farming in Tunisia
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA-UPC-IRTA - Centre de Recerca en Economia i Desenvolupament Agroalimentari UPC-IRTA, Yangui, Ahmed, Gil Roig, José María, Guesmi, Bouali, Taghouti, Ibtissem, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA-UPC-IRTA - Centre de Recerca en Economia i Desenvolupament Agroalimentari UPC-IRTA, Yangui, Ahmed, Gil Roig, José María, Guesmi, Bouali, and Taghouti, Ibtissem
- Abstract
Cereal, oilseed, and protein (COP) production is an important sector contributing to Sustainable Development Goals (SDGs) in Tunisia. COP farms often diversify their production patterns to stabilize their income sources and spread production risk across crops. However, crop diversity may entail an inefficient use and management of resources to achieve the desired output. In addition, the COP sector still shows a low productivity level, depending on weather conditions in Tunisia. In this context, this study aimed to assess the relationship between the land use pattern and efficiency performance of farms. We used data envelopment analysis (DEA) in the presence of uncertainty based on state-contingent techniques. This approach has not previously been used to examine the links between crop pattern and efficiency. We found that specialized COP farms, on average, exhibited higher technical efficiency levels than those adopted mix cropping systems (83% and 60%, respectively), indicating an important margin to reduce inefficiency. Nevertheless, both diversified and specialized farms could reduce their inefficiency levels through more rational input use to attain the current level of production. Some practical implications were derived to target policy interventions to enhance agricultural productivity and resource use efficiency., Objectius de Desenvolupament Sostenible::12 - Producció i Consum Responsables, Postprint (published version)
- Published
- 2022
5. Note d’orientation n° 1: Des institutions et une coordination efficaces pour un environnement institutionnel favorisant l’inclusion des jeunes agri-entrepreneurs
- Author
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Fiedler, Yannick, Elloumi, Mohamed, Ouertani, Emna, Yangui, Ahmed, and Ben Saad, Abdallah
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investissement agricole responsable ,production de produits agricoles ,zone rurale ,esprit d’entreprise ,Tunisie ,travail des jeunes - Abstract
En Tunisie, le renouvellement générationnel des chefs d’exploitations et la dynamisation de l’environnement de la production agricole et des territoires nécessitent une intensification des opérations d’investissement portées prioritairement par des jeunes. En même temps, des investissements à même de redynamiser les territoires ruraux permettraient de combattre le chômage des jeunes en Tunisie, qui est particulièrement élevé dans les régions de l’intérieur du pays. Ce document d’orientation fournit des recommandations concrètes pour renforcer les institutions et la coordination entre elles pour promouvoir l’inclusion des jeunes agri-entrepreneurs à travers des actions de court-terme et notamment: (i) l’amélioration de la coordination entre les institutions tout au long du processus d’investissement, de l’idée du projet à l’après création, (ii) la mise en place d’espaces de coordination et d’échange d’informations entre les institutions, (iii) par la formalisation de ces espaces dont notamment les guichets uniques, (iv) l’adoption d’une approche territoriale pour l’orientation de l’investissement par les jeunes et enfin (v) la mise en place d’une formation sur le montage des projets. Le document d’orientation fait partie d’une série de notes sur la promotion de l’investissement responsable des jeunes en Tunisie portant sur (i) la coordination et le cadre institutionnel; (ii) les services financiers et des incitations à l’investissement; et (iii) l’accès à l’information et la communication. Ces notes sont le résultat des travaux de trois groupes de travail mis en place dans le cadre du Pôle de réflexion sur les investissements des jeunes agri-entrepreneurs (PRIJA) de l'Institut national de la recherche agronomique de Tunisie (INRAT), organisé en coopération avec la FAO et l'Agence de promotion des investissements agricoles (APIA).
- Published
- 2021
6. Note d’orientation n° 2: Des services financiers et des incitations à l’investissement plus accessibles pour les jeunes agri-entrepreneurs
- Author
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Fiedler, Yannick, Elloumi, Mohamed, Ouertani, Emna, Yangui, Ahmed, and Ben Saad, Abdallah
- Subjects
incitation ,investissement agricole responsable ,production de produits agricoles ,entrepreneur ,promotion des investissements ,Tunisie - Abstract
En Tunisie, le renouvellement générationnel des chefs d’exploitations et la dynamisation de l’environnement de la production agricole et des territoires nécessitent une intensification des opérations d’investissement portées prioritairement par des jeunes. En même temps, des investissements à même de redynamiser les territoires ruraux permettraient de combattre le chômage des jeunes en Tunisie, qui est particulièrement élevé dans les régions de l’intérieur du pays. Ce document d’orientation fournit des recommandations concrètes pour renforcer l’accès des jeunes agri-entrepreneurs aux services et aux incitations financiers à travers des actions de court-terme et notamment: (1) l’amélioration de l’accès des jeunes agri-entrepreneurs aux crédits bancaires, (2) le renforcement de leur accès aux financements et incitations publiques, (3) une meilleure mobilisation des fonds en coopérant avec les partenaires technico-financiers, (4) la mise en œuvre des financements participatifs, (5) la révision du cadre législatif des organisations professionnelles afin de leur donner plus d’autonomie et plus de capacité pour la médiation en termes d’accès aux crédits et de garanties, et (6) la relance des crédits chaînes de valeurs avec une meilleure implication des banques. Le document d’orientation fait partie d’une série de notes sur la promotion de l’investissement responsable des jeunes en Tunisie portant sur (i) la coordination et le cadre institutionnel; (ii) services financiers et des incitations à l’investissement; et (iii) l’accès à l’information et la communication. Ces notes sont le résultat des travaux de trois groupes de travail mis en place dans le cadre du Pôle de réflexion sur les investissements des jeunes agri-entrepreneurs (PRIJA) de l'Institut national de la recherche agronomique de Tunisie (INRAT), organisé en coopération avec la FAO et l'Agence de promotion des investissements agricoles (APIA).
- Published
- 2021
7. Trade-Off between Land Use Pattern and Technical Efficiency Performance: Evidence from Arable Crop Farming in Tunisia.
- Author
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Guesmi, Bouali, Yangui, Ahmed, Taghouti, Ibtissem, and Gil, José Maria
- Subjects
CROPS ,LAND use ,DATA envelopment analysis ,AGRICULTURAL resources ,CROPPING systems - Abstract
Cereal, oilseed, and protein (COP) production is an important sector contributing to Sustainable Development Goals (SDGs) in Tunisia. COP farms often diversify their production patterns to stabilize their income sources and spread production risk across crops. However, crop diversity may entail an inefficient use and management of resources to achieve the desired output. In addition, the COP sector still shows a low productivity level, depending on weather conditions in Tunisia. In this context, this study aimed to assess the relationship between the land use pattern and efficiency performance of farms. We used data envelopment analysis (DEA) in the presence of uncertainty based on state-contingent techniques. This approach has not previously been used to examine the links between crop pattern and efficiency. We found that specialized COP farms, on average, exhibited higher technical efficiency levels than those adopted mix cropping systems (83% and 60%, respectively), indicating an important margin to reduce inefficiency. Nevertheless, both diversified and specialized farms could reduce their inefficiency levels through more rational input use to attain the current level of production. Some practical implications were derived to target policy interventions to enhance agricultural productivity and resource use efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. Protected Geographical Indications for EVOO in Tunisia: Towards Environmental, Social, and Economic Sustainable Development
- Author
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Clodoveo, Maria Lisa, primary, Yangui, Ahmed, additional, Fendri, Mahdi, additional, Giordano, Simona, additional, Crupi, Pasquale, additional, and Corbo, Filomena, additional
- Published
- 2021
- Full Text
- View/download PDF
9. Spanish consumers’ behaviour and the determining factors of their willingness to pay for organic olive oil Comportamiento de los consumidores españoles y los factores determinantes de su disposición a pagar por el aceite de oliva ecológico
- Author
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Yangui, Ahmed, Gil Roig, José María|||0000-0003-3313-9052, Costa Font, Montserrat, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, and Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari
- Subjects
Enginyeria agroalimentària::Agricultura::Olivicultura [Àrees temàtiques de la UPC] ,Experimento de elección ,Comportamiento del consumidor ,Consumers -- Attitudes ,Agrotech ,Consumidors -- Actituds ,Disposición a pagar - Abstract
Al igual que el resto de alimentos ecológicos, la demanda de aceite de oliva ecológico crece a un ritmo lento y continúa teniendo un carácter emergente en España. Ante esta situación, se considera importante analizar las preferencias, percepciones y valoraciones de los consumidores acerca del aceite de oliva virgen extra ecológico. Mediante un experimento de elección y la estimación de un modelo de clases latentes (LC) se evalúa la disposición a pagar de los consumidores catalanes hacia este producto.
- Published
- 2019
10. Comparing results of ranking conjoint analyses, best–worst scaling and discrete choice experiments in a nonhypothetical context
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Faiçal, Akaichi, Costa Font, Montserrat, Gil Roig, José María, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Faiçal, Akaichi, Costa Font, Montserrat, and Gil Roig, José María
- Abstract
This study assesses the comparability of discrete choice experiment (DCE), ranking conjoint analysis (RCA) and multiprofile best–worst scaling (BWS) in a nonhypothetical context in terms of estimated partworths, willingness to pay (WTP), response consistency and external validity. Overall, the results suggest that: (i) the conjoint analysis formats that were used in this study provide similar estimated WTP, but different estimated partworths and computed external validity, Peer Reviewed, Postprint (updated version)
- Published
- 2019
11. Spanish consumers’ behaviour and the determining factors of their willingness to pay for organic olive oil Comportamiento de los consumidores españoles y los factores determinantes de su disposición a pagar por el aceite de oliva ecológico
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Gil Roig, José María, Costa Font, Montserrat, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Gil Roig, José María, and Costa Font, Montserrat
- Abstract
Al igual que el resto de alimentos ecológicos, la demanda de aceite de oliva ecológico crece a un ritmo lento y continúa teniendo un carácter emergente en España. Ante esta situación, se considera importante analizar las preferencias, percepciones y valoraciones de los consumidores acerca del aceite de oliva virgen extra ecológico. Mediante un experimento de elección y la estimación de un modelo de clases latentes (LC) se evalúa la disposición a pagar de los consumidores catalanes hacia este producto., Postprint (published version)
- Published
- 2019
12. Investigating attribute non-attendance effects in conjoint analysis methods performance: Choice experiment, ranking conjoint analysis and best worst scaling
- Author
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Yangui, Ahmed, Faiçal, Akaichi, Gil Roig, José María|||0000-0003-3313-9052, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, and Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari
- Subjects
Choice experiment ,Enginyeria agroalimentària::Aspectes econòmics [Àrees temàtiques de la UPC] ,Consumers -- Attitudes ,Agrotech ,Consumidors -- Actituds - Abstract
This paper addresses a set of methodological questions. First, it assesses the variation of the level of ANA in different non-hypothetical CA formats. Second, it explores whether asking respondents to report the attributes they ignored after each choice set or at the end of the choice task yield comparable results. Lastly, it explores the implications of taking into account ANA information on respondents’ willingness to pay and on the external predictive powers of the estimated parameters. To answer these research questions, three treatments were carried out, non-hypothetical CE (NHCE), non-hypothetical RCA (NHRCA) and nonhypothetical BWS (NHBWS).
- Published
- 2018
13. Comparing results of ranking conjoint analyses, best–worst scaling and discrete choice experiments in a nonhypothetical context
- Author
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Yangui, Ahmed, primary, Akaichi, Faical, additional, Costa‐Font, Montserrat, additional, and Gil, José Maria, additional
- Published
- 2019
- Full Text
- View/download PDF
14. Investigating attribute non-attendance effects in conjoint analysis methods performance: Choice experiment, ranking conjoint analysis and best worst scaling
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Faiçal, Akaichi, Gil Roig, José María, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Faiçal, Akaichi, and Gil Roig, José María
- Abstract
This paper addresses a set of methodological questions. First, it assesses the variation of the level of ANA in different non-hypothetical CA formats. Second, it explores whether asking respondents to report the attributes they ignored after each choice set or at the end of the choice task yield comparable results. Lastly, it explores the implications of taking into account ANA information on respondents’ willingness to pay and on the external predictive powers of the estimated parameters. To answer these research questions, three treatments were carried out, non-hypothetical CE (NHCE), non-hypothetical RCA (NHRCA) and nonhypothetical BWS (NHBWS)., Postprint (published version)
- Published
- 2018
15. The effect of personality traits on consumers' preferences for extra virgin olive oil
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Costa Font, Montserrat, Gil Roig, José María, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya. CREDA - Centre de Recerca en Economia i Desenvolupament Agroalimentari, Yangui, Ahmed, Costa Font, Montserrat, and Gil Roig, José María
- Abstract
The aim of this paper is to investigate the role of psychological factors on building the consumer's behavioral decision process towards extra virgin olive oil, with special attention paid to the organic attribute. The paper hypothesises that differences in consumers' personality traits, such as food-related personality traits, purchasing habits and lifestyles, affect consumers' preferences for extra virgin olive oil. The methodological framework is based on the specification of an extended hybrid choice model (HCM), which was estimated following a two-step procedure. In the first step, a structural equation model was estimated to test for hierarchical relationships between latent variables to explain purchasing intentions towards an organic olive oil. In the second step, the predicted latent variables were introduced in a random parameter logit (RPL) model to investigate the main determinants of consumers' choices related to extra virgin olive oil and the specific role of the organic attribute. The results from this study reinforce the need to include the psychological characteristics of consumers, such as attitudes, food-related personality traits, purchase habits and lifestyle orientation, to better explain how individuals make food choices and to better understand the decision maker's process. Interestingly, Catalan consumers perceive a disutility from the organic attribute compared to other production system alternatives (conventional and PDO), while subjective norms and a higher perception of behavioral control only partially mitigate this effect. Environmental or health concerns seem to not be relevant to consumers' choices related to olive oil as the conventional olive oil is already perceived as a healthy product per se. (C) 2016 Elsevier Ltd. All rights reserved., Postprint (published version)
- Published
- 2016
16. Consumer preference heterogeneity towards olive oil virgin extra : hypothetical and non-hypothetical choice experiments
- Author
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Yangui, Ahmed, Gil, José M. (José María Gil Roig), Costa Font, Monserrat, Universitat Politècnica de Catalunya. Institut Universitari de Recerca en Ciència i Tecnologies de la Sostenibilitat, and Gil Roig, José María
- Subjects
Desenvolupament humà i sostenible [Àrees temàtiques de la UPC] ,663/664 - Abstract
The present dissertation aim a contributing to both agricultural economics and marketing literature by addressing specific issues related to discrete choice models and choice experiments. More precisely, this thesis focuses on two main issues: 1) new tools to tackle with preference heterogeneity; and 2) new response formats to allows researchers to take into account the information provided by no chosen profiles. These two issues have generated three studies, which form the main core of this thesis: two are related to issue 1) (Chapters 2 and 3), while the third one is related to the issue 2) (Chapter 4). In the first one, we evaluate consumers' preferences heterogeneity using a methodological framework with two novelties over past studies: 1) it accounts for both preference heterogeneity around the mean and the variance of random parameters; and 2) it considers both socio-demographic characteristics of consumers as well as their attitudinal factors. Results suggest that the proposed framework significantly increase the good-of-Fit and provides more useful insights for policy analysis. The most important attribute affecting consumers' preferences towards extra virgin olive oil are the price and the product's origin. The consumers perceive the organic olive oil attribute negatively, as they think that it is not worth paying a premium for a product that is healthy in nature. The second paper hypothesizes that differences in consumers' personality traits, such as food-related personality traits, purchasing habits and lifestyles, affect consumers' preferences for extra virgin olive oil. The methodological framework is based on the specification of an extended hybrid choice model (HCM), which was estimated following a two-step procedure. In the first step, a structural equation model was estimated to test hierarchical relationships between latent variables to explain purchasing intentions towards an organic olive oil. In the second step, the resulting latent variables were introduced in a random parameter logit (RPL) model to investigate the main determinants of consumers' choices related to extra virgin olive oil. The results from this study reinforce the need to include the psychological characteristics of consumers to better explain how individuals make food choices and to better understand the decision maker's process. Interestingly, Catalan consumers perceive a disutility from the organic attribute compared to other production system alternatives (conventional and PDO), while subjective norms and a higher perception of behavioural control only partially mitigate this effect. Environmental or health concerns seem to not be relevant to consumers' choices related to organic olive oil as the conventional olive oil is already perceived as a healthy product per se. In the third paper, we compares the ability of hypothetical and non-hypothetical choice experiment respect to incentive compatible ranking conjoint analysis and incentive compatible sequential best worst scaling. The comparison done in terms of estimated partworths, internal and external predictive power, estimated WTP, and participants' response consistency. In general, the results reveal higher preferences regularity between the respondents across the different treatments implying not statistically difference in the marginal participants' WTP. Additionally, the participants behave similarly whether there are asked to choose or to state their most preferred through the two ranking elicitation mechanism. The best worst scaling (BWS) format has been revealed to outperform the other formats in terms of predictive power as its cognitive process seems to better fits the natural tendency of humans at identifying the extreme values., Esta tesis doctoral trata de realizar algunas contribuciones relevantes para el campo de la Economía y el Marketing Agroalimentario en el diseño de los experimentos de elección y en la estimación de los modelos de elección discreta. Concretamente, la tesis aborda dos cuestiones principales: 1) la utilización de nuevas herramientas de estimación que tengan en cuenta la heterogeneidad de las preferencias de los consumidores; 2) el diseño de nuevos formatos de respuesta en los que se tenga en cuenta la información proporcionada por las opciones de productos no elegidas en los conjuntos de elección. Estas dos cuestiones se han abordado en los tres capítulos centrales en los que se estructura la tesis. Los dos primeros capítulos están relacionados con la heterogeneidad de las preferencias (capítulo 2 y 3), mientras que el tercero está relacionado con la segunda cuestión (capítulo 4). En el Capítulo 2, el análisis de la heterogeneidad de las preferencias se ha basado en la utilización de dos herramientas novedosas en relación a la literatura existente: 1) la consideración explícita de la heterogeneidad de la preferencia en torno tanto a la media como a la varianza de los parámetros aleatorios; y 2) la inclusión no sólo de las características socio-demográficas de los consumidores sino también de las lexicográficas. Los coeficientes estimados y los momentos de la distribución de la Disposición a Pagar (DAP) han sido comparadas con las obtenidas en el modelo más utilizado en la literatura, el modelo Logit de parámetros aleatorios (RPL). Los resultados indican que el marco metodológico propuesto permite incrementar significativamente la bondad del ajuste, por lo que se obtienen estimaciones más precisas sobre las que orientar las posibles estrategias de marketing. Desde el punto de vista aplicado, el precio y el origen del producto son los atributos que más influyen en las preferencias de los consumidores hacia el aceite de oliva virgen extra. Los consumidores perciben negativamente el atributo oliva ecológico ya que piensa que no merece la pena pagar un sobreprecio para un producto que ya es considerado como sano en sí mismo. El Capítulo 3 se dedica especialmente a una cuestión que en el capítulo anterior sólo se consideró parcialmente, y es el efecto de las variables psicográficas y las actitudes en el proceso de toma de decisiones de compra por parte de los consumidores. La hipótesis de partida es que los rasgos de la personalidad de los consumidores así como sus hábitos de compra y estilos de vida, determinan sus preferencias; en este caso, hacia el aceite de oliva virgen extra. El marco metodológico adoptado se basa en la especificación de un modelo de elección híbrida extendido (HCM), que se estimó siguiendo un procedimiento a dos etapas. En la primera etapa, se estimó un modelo de ecuaciones estructurales para determinar las relaciones jerárquicas entre las variables latentes con el objetivo de explicar las intenciones de compra de los consumidores hacia el aceite de oliva ecológico. En la segunda etapa, las variables latentes resultantes fueron introducidas en un modelo Logit de parámetros aleatorios (RPL) con el fin de estudiar los factores determinantes de la elección del aceite de oliva virgen extra por parte de los consumidores. Los resultados de este Capítulo refuerzan la idea de la necesidad de tener en cuentas factores de personalidad y actitudes a la hora de analizar las preferencias de los consumidores y sus procesos de toma de decisiones. Consistente con el capítulo anterior, el atributo ecológico no es relevante a la hora de elegir un aceite de oliva en relación a otros sistemas de producción (convencional y Denominación de Origen Protegida), mientras que las normas subjetivas y una mayor percepción de control del comportamiento sólo atenúan parcialmente este efecto. Las preocupaciones ambientales o de salud parecen no tener ningún impacto relevante en las elecciones de los consumidores del aceite de oliva ecológico. En el Capítulo 4 se hace una revisión de los diferentes formatos de respuesta que se han venido utilizando en la literatura en el análisis conjunto, prestando atención especial a los formatos de ranking (RCA) y de escalas mejor/peor (BWS). En un contexto no hipotético se comparan estos dos formatos con el experimento de elección tradicional, tomando como referencia el experimento tradicional hipotético. La comparación se hace teniendo en cuenta los parámetros estimados, la capacidad predictiva tanto interna como externa, la consistencia de las respuestas de los participantes y los valores calculados de la Disposición a Pagar. En general, los resultados revelan una cierta consistencia de los resultados, al menos en términos de la Disposición a Pagar. Asimismo, los dos métodos basados en un ranking generan resultados similares, tanto si se considera únicamente la opción preferida como la totalidad del ranking. Sin embargo, globalmente, el método de escalas mejor/peor (BWS) parece comportarse mejor en relación al resto de formatos en términos de capacidad predictiva, lo que parece confirmar que este tipo de formato se adapta mucho mejor a la tendencia natural de los seres humanos a la identificación de los valores extremos
- Published
- 2014
17. The effect of personality traits on consumers’ preferences for extra virgin olive oil
- Author
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Yangui, Ahmed, primary, Costa-Font, Montserrat, additional, and Gil, José M., additional
- Published
- 2016
- Full Text
- View/download PDF
18. The effect of food related personality traits and lifestyle orientation on consumer’s behaviour related to extra virgin olive oil: estimation of an extended hybrid choice model
- Author
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Yangui, Ahmed, Font, Montserrat Costa, and Gil, José María
- Subjects
Marketing ,FOS: Economics and business ,personality traits ,choice experiment ,Hybrid choice model ,extra virgin olive oil ,Food Consumption/Nutrition/Food Safety - Abstract
Due to the increasing interest on understanding the formation of consumer’s food choice process, the hybrid choice model (HCM) has been developed. HCM represents a promising new class of models which merge classic choice models with structural equations models (SEM) for latent variables (LV). Regardless of their conceptual appeal, up to date the application of HCM in agro food marketing remains very scarce. The present work extends previous HCM applications by first estimating a random parameter logit model (RPL) into panel data context (taking into account the heterogeneity around the mean) and second, estimating the relationships between latent variables. Furthermore, in order to ascertain the role of psychological factors in consumer’s behavioural process of decision towards a traditional food, variables such as food related personality traits, purchase habits and lifestyle orientation were introduced. The model pretends to better understand Catalan consumer’s behaviour towards extra virgin olive oil. The findings suggest that the incorporation of inferred LV for understanding individuals’ food decision making constructions is needed. That is, some LV have indirect effects associated with consumer’s purchase intention towards organic olive oil, and that almost all LV considered have a direct effect related to consumer’s utilities associated with extra virgin olive oil. The results reveal a high and significant heterogeneity, highlighting the role of the housewife with high level school education as responsible of both household food purchases and preparation of familiar dishes.
- Published
- 2013
- Full Text
- View/download PDF
19. Consumer preference heterogeneity towards olive oil virgin extra : hypothetical and non-hypothetical choice experiments
- Author
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Universitat Politècnica de Catalunya. Institut Universitari de Recerca en Ciència i Tecnologies de la Sostenibilitat, Gil Roig, José María, Costa Font, Monserrat, Yangui, Ahmed, Universitat Politècnica de Catalunya. Institut Universitari de Recerca en Ciència i Tecnologies de la Sostenibilitat, Gil Roig, José María, Costa Font, Monserrat, and Yangui, Ahmed
- Abstract
The present dissertation aim a contributing to both agricultural economics and marketing literature by addressing specific issues related to discrete choice models and choice experiments. More precisely, this thesis focuses on two main issues: 1) new tools to tackle with preference heterogeneity; and 2) new response formats to allows researchers to take into account the information provided by no chosen profiles. These two issues have generated three studies, which form the main core of this thesis: two are related to issue 1) (Chapters 2 and 3), while the third one is related to the issue 2) (Chapter 4). In the first one, we evaluate consumers' preferences heterogeneity using a methodological framework with two novelties over past studies: 1) it accounts for both preference heterogeneity around the mean and the variance of random parameters; and 2) it considers both socio-demographic characteristics of consumers as well as their attitudinal factors. Results suggest that the proposed framework significantly increase the good-of-Fit and provides more useful insights for policy analysis. The most important attribute affecting consumers' preferences towards extra virgin olive oil are the price and the product's origin. The consumers perceive the organic olive oil attribute negatively, as they think that it is not worth paying a premium for a product that is healthy in nature. The second paper hypothesizes that differences in consumers' personality traits, such as food-related personality traits, purchasing habits and lifestyles, affect consumers' preferences for extra virgin olive oil. The methodological framework is based on the specification of an extended hybrid choice model (HCM), which was estimated following a two-step procedure. In the first step, a structural equation model was estimated to test hierarchical relationships between latent variables to explain purchasing intentions towards an organic olive oil. In the second step, the resulting latent variables we, Esta tesis doctoral trata de realizar algunas contribuciones relevantes para el campo de la Economía y el Marketing Agroalimentario en el diseño de los experimentos de elección y en la estimación de los modelos de elección discreta. Concretamente, la tesis aborda dos cuestiones principales: 1) la utilización de nuevas herramientas de estimación que tengan en cuenta la heterogeneidad de las preferencias de los consumidores; 2) el diseño de nuevos formatos de respuesta en los que se tenga en cuenta la información proporcionada por las opciones de productos no elegidas en los conjuntos de elección. Estas dos cuestiones se han abordado en los tres capítulos centrales en los que se estructura la tesis. Los dos primeros capítulos están relacionados con la heterogeneidad de las preferencias (capítulo 2 y 3), mientras que el tercero está relacionado con la segunda cuestión (capítulo 4). En el Capítulo 2, el análisis de la heterogeneidad de las preferencias se ha basado en la utilización de dos herramientas novedosas en relación a la literatura existente: 1) la consideración explícita de la heterogeneidad de la preferencia en torno tanto a la media como a la varianza de los parámetros aleatorios; y 2) la inclusión no sólo de las características socio-demográficas de los consumidores sino también de las lexicográficas. Los coeficientes estimados y los momentos de la distribución de la Disposición a Pagar (DAP) han sido comparadas con las obtenidas en el modelo más utilizado en la literatura, el modelo Logit de parámetros aleatorios (RPL). Los resultados indican que el marco metodológico propuesto permite incrementar significativamente la bondad del ajuste, por lo que se obtienen estimaciones más precisas sobre las que orientar las posibles estrategias de marketing. Desde el punto de vista aplicado, el precio y el origen del producto son los atributos que más influyen en las preferencias de los consumidores hacia el aceite de oliva virgen extra. Los consumidores perciben negat, Postprint (published version)
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- 2014
20. Revealing additional preference heterogeneity with an extended random parameter logit model: the case of extra virgin olive oil
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Yangui, Ahmed, Costa Font, Montserrat, Gil Roig, José María, Universitat Politècnica de Catalunya. Departament d'Enginyeria Agroalimentària i Biotecnologia, Yangui, Ahmed, Costa Font, Montserrat, and Gil Roig, José María
- Abstract
Methods that account for preference heterogeneity have received a significant amount of attention in recent literature. Most of them have focused on preference heterogeneity around the mean of the random parameters, which has been specified as a function of socio-demographic characteristics. This paper aims at analyzing consumers' preferences towards extra-virgin olive oil in Catalonia using a methodological framework with two novelties over past studies: 1) it accounts for both preference heterogeneity around the mean and the variance; and 2) it considers both socio-demographic characteristics of consumers as well as their attitudinal factors. Estimated coefficients and moments of willingness to pay (WTP) distributions are compared with those obtained from alternative Random Parameter Logit (RPL) models. Results suggest that the proposed framework increases the goodness-of-fit and provides more useful insights for policy analysis. The most important attributes affecting consumers' preferences towards extra virgin olive oil are the price and the product's origin. The consumers perceive the organic olive oil attribute negatively, as they think that it is not worth paying a premium for a product that is healthy in nature., Postprint (published version)
- Published
- 2014
21. Revealing additional preference heterogeneity with an extended random parameter logit model: the case of extra virgin olive oil
- Author
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Yangui, Ahmed, primary, Costa-Font, Montserrat, additional, and Gil, Jose M., additional
- Published
- 2014
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