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Twin births are often used to instrument for fertility when investigating the impact of family size on labor market outcomes. In this paper we consider two econometric problems both related to the link between fertility treatments and multiple births. The first is the potential for omitted variable bias caused by the fact that fertility treatments are typically unobserved. We present estimates corrected for this bias and find it to be comparatively small. Second, we show that the effects of twin-birth induced variation in family size vary substantially with time passed since birth, which has consequences for the interpretation of estimates based on a single cross-section.

I exploit exogenous changes in school year length in Germany in 1966 and 1967 to study the causal effect of education on health. Controlling for cohort, school track and Federal states fixed effects, which fully control for the assignment into treatment, reveals no differences in body weight, mental or physical health between affected and non-affected individuals. Additional robustness checks suggest that selection effects of individuals into non-affected Federal states play no role.

I exploit exogenous variation in the likelihood to obtain any sort of academic degree between January- and February-born individuals for 13 academic cohorts in England. For these cohorts compulsory schooling laws interacted with the timing of the CGE and O-level exams to change the probability of obtaining an academic degree by around 2 to 3 percentage points. I then use data on individuals born in these two months from the British Labour Force Survey and the Health Survey for England to investigate the effects of education on health using being February-born as an instrument for education. The results indicate neither an effect of education on various health related measures nor an effect on health related behaviour, e.g., smoking, drinking or eating various types of food.

In this paper, I contrast the effects of individual and spousal disability on subjective wellbeing and labor supply using data on couples from the German Socio-Economic Panel for the years 1984 to 2006. I find that both men and women reduce their propensity to work when they or their partner become disabled. The effects of spousal disability are economically large. I find no evidence for hours and wage adjustments by spousal disability, although there are wage effects of individual disability. The life-satisfaction of women, but not of men, is reduced considerably by their partners’ disability. The effects are about 33 to 50% as large as those of individual disability. I also find no evidence that individuals adapt to their partners’ disability, although there is adaption to individual disability.

Using data from the Behavioral Risk Factor Surveillance System for 2006, I test recent theoretical predictions on social comparisons influencing individual Body Mass Index (BMI). I find that in particular the average BMI of individuals in the same county-age-gender-cell as the respective individual influences BMI. Evidence from quantile regressions points towards significant heterogeneity of effects along the distribution. However, there is no evidence of some individuals becoming slimmer as a result of preferences for deviant behaviour. Life satisfaction regressions show a positive effect for BMI relative to the county average. Paradoxically, BMI relative to the cell average seems to have no effect on life satisfaction. These two results contradict most theories of social comparisons.

This paper provides first evidence on the anatomy of human capital externalities arising from both firm-level and regional human capital. Using panel data from German social security records, both at an individual and aggregated at the plant and regional level, I estimate earnings functions incorporating measures of regional and firm-level human capital while controlling for various types of unobserved heterogeneity. The results suggest that the firm-level share of high-skilled workers generates positive, although small social returns to education for low-skilled and skilled workers but not for the high-skilled. This finding is in line with learning based theories of human capital externalities. Some estimates also suggest negative social returns for the regional shares of low-skilled workers. No such effects are found for the firm-level shares of low-skilled workers and the regional shares of high-skilled workers.

This paper provides first evidence on the social returns to education from both firm-level and regional human capital. Using panel data from German social security, both at an individual and aggregated at the plant and regional level, I estimate earnings functions incorporating measures of regional and firm-level human capital while controlling for various types of unobserved heterogeneity, demand shocks, regional physical capital and other regional and firm-level confounders. The results suggest negligibly small external returns to the firm-level shares of high-skilled workers. On the regional level, the results show no support for external returns to education, except for skilled workers.

We use a unique rich newly built data set for German manufacturing enterprises to investigate the relationship between product diversification and the stability of sales and employment. We find that contrary to portfolio theoretic considerations more diversified firms exhibit a higher variability of sales and employment. However, the effects are negligibly small from an economics point of view.

This paper considers the (short run) employment and wage effects of the 2004 EUenlargement on firms located close to Germany's Eastern border. We use a 50% sample of Germans plants and apply difference-in-differences-estimators combined with a matching approach. We evaluate changes in total employment, the employment shares of low-skilled and Eastern European workers and the wages for low-skilled, skilled and high-skilled workers in various sectors. Our results suggest negative (short-run) effects of the EU-enlargement on employment in construction and the business services sector, where we also find negative wage effects. Wages and employment in manufacturing, wholesale and retail trade, hotels and restaurants and social and personal service activities seem to have been relatively less affected.

This paper considers the impact of adverse health shocks that hit an individual's partner on subjective well-being. Using data on couples from the German Socio-Economic Panel for the years 1984 to 2006, I compare the losses in well-being caused by own and spousal disability using panel-regressions. I find that women and to a lesser extent men are harmed by spousal disability which is consistent with the existence of other-regarding preferences within couples. The magnitude of effects suggests that spousal disability is about one quarter to one half as harmful as individual disability with larger effects being found for women.

Economic theory suggests both positive and negative relationships between intra-firm wage inequality and productivity. This paper contributes to the growing empirical literature on this subject. We combine German employer-employee-data for the years 1995-2005 with inequality measures using the whole wage distribution of a firm and rely on dynamic panel-data estimators to control for unobserved heterogeneity, simultaneity problems and possible state dependence. Our results indicate a relative minor influence of intra-firm wage inequality on firm productivity. If anything, they provide some support for a view suggesting that some inequality may be beneficial, while too much leads to a detrimental effect on productivity.

This paper considers the impact of tobacco consumption on wages in the UK using data from fifteen waves of the British Household Panel Survey. Considering both overall smoker status as well as the number of cigarettes consumed, we provide estimates for the smoking wage penalty using standard regression methods, including panel estimators for fixed effects and panel instrumental variable estimators. Furthermore, we analyse the impact of stopping and starting to smoke relative to permanent smokers and non-smokers by Mahalanobis-matching. In the cross-section, we find a rather large wage penalty for smokers of about 4%. However, panel estimator and IV results show relatively few support for hypotheses linking the smoking wage penalty to either lower productivity of smokers, be it health related or not, or discrimination. Matching results suggest that starting or stopping to smoke does not affect later earnings relative to remaining either smoker or non-smoker.

This paper investigates the gender wage gap among skilled German workers after the end of vocational training using data from social security record. Using information on worker and plant characteristics for both the training plant and the current employer, results from standard decomposition techniques show that up to 91% of an initial 14% earnings disadvantage for women in the first job can be attributed to differences in endowments. Of these, occupational segegreation explains up to two thirds of the earnings gap, with plant characteristics accounting for up to 30%.

This paper investigates the gender wage gap among German university graduates in their first job and five to six years into their careers. We find that women earn about 30% less than men at their first job and about 35% less after five to six years. Results from standard decomposition techniques show that 80% of the earnings gap in the first job can be attributed to differences in endowment of which between 74 and 78% are related to different fields of studies.

Diese Studie untersucht mit Hilfe eines neu verfügbaren Datensatzes aus Prozessdaten der Bundesagentur für Arbeit, der Stichprobe der integrierten Erwerbsbiographien, die Wirkung einer verpflichtenden Beschäftigungsquote für schwerbehinderte Arbeitnehmer in Deutschland. Wir nutzen die exogene Senkung dieser Quote durch die Einführung des Gesetzes zur Bekämpfung der Arbeitslosigkeit Schwerbehinderter als natürliches Experiment und schätzen die Änderung in der Wahrscheinlichkeit einer Beschäftigungsaufnahme durch regressionkorrigierte Difference-in-Difference-Schätzer. Unsere Ergebnisse legen nahe, dass die Änderung der Beschäftigungsquote die Beschäftigungschancen von Schwerbehinderten weder verbessert noch verschlechtert hat. - This paper uses new administrative data from the Federal Employment Agency the Integrated Employment Biographies Sample IEBS to asses the impact of a mandatory employment quota for disabled workers in Germany. We use an exogenous change, introduced through a legislative change in the Gesetz zur Bekämpfung der Arbeitslosigkeit Schwerbehinderter, as a natural experiment and measure the change in the reemployment probability of the unemployed disabled by regression-adjusted difference-in-difference-estimators. Our results indicate that the change in the employment quota did not influence the employment prospects of the disabled.

Discrimination, September 11th, Exit from unemployment. This paper examines whether the attacks on the World Trade Center and the Pentagon on September 11th, 2001 have influenced the job prospects of Arabs in the German labor market. Using a large, representative database of the German working population, the attacks are treated as a natural experiment that may have caused an exogenous shift in attitudes toward persons who are perceived to be Arabs. Evidence from regression-adjusted difference-in-differences-estimates indicates that 9/11 did not cause a severe decline in job prospects. This result is robust over a wide range of control groups and several definitions of the sample and the observation period. Several explanations for this result, which is in line with prior evidence from Sweden, are offered.

Dieses Papier präsentiert deskriptive Evidenz zur Struktur von Ich-AG-Gründungen und Gründern aus dem Arbeitsagenturbezirk Lüneburg. Die Ergebnisse basieren auf einer Befragung aller Gründer, die zwischen Juni 2004 und Februar 2005 selbstständig geworden sind und von der Arbeitsagentur Lüneburg gefördert wurden.

This paper uses data from the German Socio-Economic Panel for the years 2000 to 2005 to study the earnings differential between self- and dependent employed German men. Constructing a counterfactual earnings distribution for the self-employed in dependent employment and using quantile regression decompositions we find that the earnings differential over the distribution cannot be explained by differences in endowments. Furthermore, low-earning self-employed could earn more in dependent employment. Finally, the observed earnings advantage for the self-employed at the top of the earnings distribution is not associated with higher returns to observable variables. This paper uses data from the German Socio-Economic Panel for the years 2000 to 2005 to study the earnings differential between self- and dependent employed German men. Constructing a counterfactual earnings distribution for the self-employed in dependent employment and using quantile regression decompositions we find that the earnings differential over the distribution cannot be explained by differences in endowments. Furthermore, low-earning self-employed could earn more in dependent employment. Finally, the observed earnings advantage for the self-employed at the top of the earnings distribution is not associated with higher returns to observable variables.