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Because consumer reviews leverage the wisdom of the crowd, the way in which they are aggregated is a central decision faced by platforms. We explore this “rating aggregation problem” and offer a structural approach to solving it, allowing for (1) reviewers to vary in stringency and accuracy, (2) reviewers to be influenced by existing reviews, and (3) product quality to change over time. Applying this to restaurant reviews from Yelp.com, we construct an adjusted average rating and show that even a simple algorithm can lead to large information efficiency gains relative to the arithmetic average. [ABSTRACT FROM AUTHOR]

We examine the role of price transparency in consumer preferences and demand. We assemble a detailed dataset on the driving school industry in Portugal to quantify how firms present the price of the course of instruction, and its individual components, to potential students. Our unique data allows us to estimate a structural model of school choice and measure the impact of varying levels of price information on demand. The results show that consumers are willing to pay a significant amount for price transparency, on average 11% of the service price, and that consumer demographics drive heterogeneous preferences for transparency. [ABSTRACT FROM AUTHOR]

Consumers are often uncertain about their product valuation before purchase. They may bear the uncertainty and purchase the product without deliberation. Alternatively, consumers can incur a deliberation cost to find out their true valuation and then make their purchase decision. This paper proposes that consumer deliberation about product valuation can be an endogenous mechanism to enable credible quality signaling. We demonstrate this point in a simple setup in which product quality influences the probability that the product has high valuation. We show that with endogenous deliberation there may exist a unique separating equilibrium in which the high-quality firm induces consumer deliberation by setting a high price whereas the low-quality firm prevents deliberation by charging a low price. Compared to the case of complete information, the price of the high-quality firm can be distorted upward to facilitate consumer deliberation, or distorted downward to avoid the low-quality firm's imitation. In an extension we show that dissipative advertising can facilitate quality signaling. The high-quality firm can utilize advertising spending to avert imitation from the low-quality firm without distorting price downward, earning a higher profit than that without advertising. However, advertising mitigates the distortion at the expense of consumer surplus and social welfare. [ABSTRACT FROM AUTHOR]

This paper develops a theory of umbrella branding as a way to link the reputations of otherwise unrelated products. The analysis predicts that umbrella branding can credibly signal positive correlation between the qualities of the included products to consumers, but cannot certify high quality or signal negative quality correlation. Moreover, whenever umbrella branding signals perfect positive quality correlation, firms that already sell a high (low) quality product have stronger (weaker) incentives to invest in developing another high quality product than new entrants. [ABSTRACT FROM AUTHOR]

While there is a great deal of theoretical and experimental literature on what factors affect bargaining outcomes, there is little empirical work based on data from real markets. In this paper we analyze negotiations for new cars, a $340 billion industry in the United States in 2010. Our results suggest that search costs, incomplete information, and bargaining disutility have an economically significant effect in real-world negotiations: we estimate that relative to an uninformed consumer, a consumer with basic information about the seller's reservation price and his own outside options captures 15% of the average dealer margin from selling an automobile. We also find that a buyer's search cost and bargaining disutility have significant effects on bargaining outcomes. Finally, our results show that while search is common, there remains a substantial group of consumers who do not engage in any of the search behaviors we measure. We hypothesize that these buyers are not aware of how easy and effective certain activities in improving negotiation outcomes can be. [ABSTRACT FROM AUTHOR]

We study upselling in markets where the seller observes consumer need but the consumer herself may not (e.g., medical care, durable repairs, financial and legal services). The seller may recommend excessive product features to uninformed consumers. In a monopoly with two types of consumer (one with a basic need and the other an advanced need) and two types of service (a basic service which fulfills only the basic need and an advanced service which fulfills both needs), we investigate the firm's honesty and product-line pricing. We reach several results. First, the firm is honest if the basic service is superior (in that it generates higher per-capita social surplus than the advanced service under the efficient allocation) or if the consumers with the basic need are sufficiently many. Second, when there exist informed consumers who neglect seller recommendation, the presence of informed consumers may cause consumer welfare to decrease, and a larger informed population may cause firm profits and social welfare to increase or decrease. Lastly, when the informed consumers boycott a dishonest firm and withhold purchase, firm profits may increase because the threat of boycotting makes the firm more credible and allows a higher price of the advanced service. [ABSTRACT FROM AUTHOR]

I analyze a dynamic duopoly with an infinite horizon where consumers are uncertain about their potential satisfaction from the products and face switching costs. I derive sufficient conditions for the existence of a Markov Perfect Equilibrium(MPE) where switching takes place each period. I show that when switching costs are sufficiently low, the prices in the steady state are lower than what they would have been when they are absent. This result is in contrast to those found in the literature. In the presence of low switching costs competition can be fiercer. [ABSTRACT FROM AUTHOR]

We use a panel data set that combines annual brand-level advertising expenditures for over three hundred brands with measures of brand awareness and perceived quality from a large-scale consumer survey to study the effect of advertising. Advertising is modeled as a dynamic investment in a brand’s stocks of awareness and perceived quality and we ask how such an investment changes brand awareness and quality perceptions. Our panel data allow us to control for unobserved heterogeneity across brands and to identify the effect of advertising from the time-series variation within brands. They also allow us to account for the endogeneity of advertising through recently developed dynamic panel data estimation techniques. We find that advertising has consistently a significant positive effect on brand awareness but no significant effect on perceived quality. [ABSTRACT FROM AUTHOR]

Cellular phone carriers typically offer complicated nonlinear tariffs. Consumers make a discrete choice among several rate plans. Each plan has a nonlinear price schedule, and price is usually lower for in-network calls. I present an empirical framework to estimate demand under such nonlinear pricing schemes by using parsimonious carrier-level data and apply the estimation method to analyze the market in Taiwan. I evaluate the impacts of termination-based pricing schemes on the market structure by counterfactual simulations. There is no evidence showing that the network effect resulting from termination-based pricing has significant effects on market structure. [ABSTRACT FROM AUTHOR]

In direct competition between national brands of consumer packaged goods (CPG), one brand often has a large local share advantage over the other despite the similarity of the branded products. I present an explanation for these large and persistent advantages in the context of local competition on perceived quality or brand image. The main result of the analysis is a relation between varying degrees of product similarity and equilibrium outcomes of local share advantages. Namely, I find that asymmetric quality positioning and associated local share advantages emerge especially when competing brands are objectively similar. Conversely, local share asymmetries based on brand positioning occur less when brands are dissimilar. This paper provides two reinforcing intuitions for this result. First, if brands are objectively similar, different levels of investment in local quality perceptions co-exist in equilibrium in the same market, because this investment is often borne as fixed cost. Also, early movers will invest in high perceived quality, whereas late movers have less incentive to invest because of demand sharing and increased price competition. Second, if the local advantages are shared by competitors across markets, the persistence of these advantages is reinforced by multimarket contact. Even when local brand building is free, firms may not want to improve perceived quality in their “weak” markets if it initiates retaliation by the competition in their “strong” markets. The increase in multimarket profits from collusion is large when the products are similar, because price competition looms large. [ABSTRACT FROM AUTHOR]

Competing firms often use product lines to screen different types of customers. Examples include, in general markets, product lines that screen the purchasing ability or preference for quality; in credit markets, product lines that screen the risk of the projects with different collateral; in insurance markets, product lines that screen the risk of accident with different coverage; and in labor markets, wage schedules that screen the employees’ abilities with different education levels. In some of these markets there can be some natural quality constraints: a maximum available quality in general markets, no negative collateral in credit markets; coverage not above 100% in insurance markets; minimum education level in labor markets. We present sufficient conditions for the existence of a pure strategies equilibrium (in such markets) under differentiation and a continuous distribution of customer types. We show that the equilibrium exists if there is a sufficiently high degree of differentiation among firms. Furthermore, we show that this equilibrium involves, under certain general conditions, pooling of customer types at the top and at the bottom of the distribution of customer types. The middle types may still be screened by the firms. [ABSTRACT FROM AUTHOR]