reputation and prices on the e market evidence from a major french platform we use an exhaustive data set from one of france s largest e commerce platforms priceminister com to estimate a statistical causal effect of a seller s reputation rating and size on transaction prices we go beyond the results currently available by tackling the issue of seller unobserved heterogeneity and the dynamics of reputation in price equations we can also produce results for a large range of product categories books cds video games or dvds product conditions used or new and seller types individual or professional sellers our results show large scale empirical evidence of a significant positive and strong effect of seller reputation on prices

market transparency adverse selection and moral hazard we study the eects of improvements in market transparency on ebay on seller exit and continuing sellers behavior an improvement in market transparency by reducing strategic bias in buyer ratings led to a significant increase in buyer valuation especially of sellers rated poorly prior to the change but not to an increase in seller exit when sellers had the choice between exiting a reduction in adverse selection and improved behavior a reduction in moral hazard they preferred the latter because of lower cost increasing market transparency improves on market outcomes

money supply and capital accumulation on the transition path revisited fischer 1979 and asako 1983 analyze the sign of the correlation between the growth rate of money and the rate of capital accumulation on the transition path both plug a constant relative risk aversion utility based on a cobb douglas and a leontief function respectively into sidrauski s model yet return contrasting results the present analysis by using a more general ces utility presents both of those settings and conclusions as limiting cases and generates economic figures more consistent with reality e g the interest rate elasticity of the money demands derived from those previous works is necessarily 1 and 0 respectively

promotional reviews an empirical investigation of online review manipulation abstract firms incentives to manufacture biased user reviews impede review usefulness we examine the differences in reviews for a given hotel between two sites expedia com only a customer can post a review and tripadvisor com anyone can post we argue that the net gains from promotional reviewing are highest for independent hotels with single unit owners and lowest for branded chain hotels with multiunit owners we demonstrate that the hotel neighbors of hotels with a high incentive to fake have more negative reviews on tripadvisor relative to expedia hotels with a high incentive to fake have more positive reviews on tripadvisor relative to expedia jel l15 l83 m31

the influence of expert reviews on consumer demand for experience goods a case study of movie critics an inherent problem in measuring the influence of expert reviews on the demand for experience goods is that a correlation between good reviews and high demand may be spurious induced by an underlying correlation with unobservable quality signals using the timing of the reviews by two popular movie critics siskel and ebert relative to opening weekend box office revenue we apply a difference in differences approach to circumvent the problem of spurious correlation after purging the spurious correlation the measured influence effect is smaller though still detectable positive reviews have a particularly large influence on the demand for dramas and narrowly released movies

the credibility revolution in empirical economics how better research design is taking the con out of econometrics since edward leamer s memorable 1983 paper let s take the con out of econometrics empirical microeconomics has experienced a credibility revolution while leamer s suggested remedy sensitivity analysis has played a role in this we argue that the primary engine driving improvement has been a focus on the quality of empirical research designs the advantages of a good research design are perhaps most easily apparent in research using random assignment we begin with an overview of leamer s 1983 critique and his proposed remedies we then turn to the key factors we see contributing to improved empirical work including the availability of more and better data along with advances in theoretical econometric understanding but especially the fact that research design has moved front and center in much of empirical micro we offer a brief digression into macroeconomics and industrial organization where progress by our lights is less dramatic although there is work in both fields that we find encouraging finally we discuss the view that the design pendulum has swung too far critics of design driven studies argue that in pursuit of clean and credible research designs researchers seek good answers instead of good questions we briefly respond to this concern which worries us little

price quality and reputation evidence from an online field experiment we examine the link between price quality seller claims and seller reputation in internet auctions after purchasing actual baseball cards and having them professionally graded we find that some buyers in the online graded market are misled by incredible claims of quality they pay higher prices but do not receive better quality and in fact are defrauded more often online seller reputation is effective for identifying good faith sellers but conditional on completed auctions reputable sellers do not provide better quality evidence also suggests that high claim sellers target less experienced buyers we attribute these patterns to two loopholes in the ebay rating system we benefited from the comments of austan goolsbee raphael thomadsen john shea dan vincent david reiley larry ausubel peter cramton v joseph hotz jeff smith jimmy chan vincent crawford mark duggan and attendees at numerous seminars and conferences we are particularly grateful to seth sanders and john list for their constructive advice at the early stage of the research to timothy bresnahan rachel kranton and thomas hubbard for their detailed suggestions in reshaping earlier versions and to editor ariel pakes and two anonymous referees for their careful readings special thanks to eight friends who acted as our agents in purchasing baseball cards in retail markets and to numerous sports card store owners who shared their insights on the sportscard industry excellent research assistance from randy alexander moore and krzysztof fizyta is gratefully acknowledged any remaining errors are ours

optimal food price stabilization in a small open developing country in poor countries most governments implement policies aiming to stabilize the prices of staple foods which often include storage and trade measures insulating their domestic market from the world market it is of crucial importance to understand the precise motivations and efficiency of those interventions because they can have consequences worldwide this paper addresses those issues by analyzing the case of a small open developing country confronted by shocks to both the crop yield and foreign price in this model government interventions may be justified by the lack of an insurance market for food prices considering this market imperfection the authors design optimal public interventions through trade and storage policies they show that an optimal trade policy largely consists of subsidizing imports and taxing exports which benefits consumers at the expense of producers import subsidies alleviate the non negativity of food storage in other words when stocks are exhausted subsidizing imports prevents domestic price spikes one striking result an optimal storage policy on its own is detrimental to consumers since its stabilizing benefits leak into the world market and it raises the average domestic price by contrast an optimal combination of storage and trade policies results in a powerful stabilizing effect for domestic food prices

social learning and peer effects in consumption evidence from movie sales using box office data for all movies released between 1982 and 2000 i quantify how much the consumption decisions of individuals depend on information they receive from their peers when quality is ex ante uncertain in the presence of social learning we should see different box office sales dynamics depending on whether opening weekend demand is higher or lower than expected i use a unique feature of the movie industry to identify ex ante demand expectations the number of screens dedicated to a movie in its opening weekend reflects the sales expectations held by profit maximizing theatre owners several pieces of evidence are consistent with social learning first sales of movies with positive surprise and negative surprise in opening weekend demand diverge over time if a movie has better than expected appeal and therefore experiences larger than expected sales in week 1 consumers in week 2 update upward their expectations of quality further increasing week 2 sales second this divergence is small for movies for which consumers have strong priors and large for movies for which consumers have weak priors third the effect of a surprise is stronger for audiences with large social networks finally consumers do not respond to surprises in first week sales that are orthogonal to movie quality like weather shocks overall social learning appears to be an important determinant of sales in the movie industry accounting for 32 of sales for the typical movie with positive surprise this implies the existence of a large social multiplier such that the elasticity of aggregate demand to movie quality is larger than the elasticity of individual demand

consumers experts and online product evaluations evidence from the brewing industry abstract the growth of the internet has led to a dramatic increase in the number of consumer or user product ratings which are posted online by individuals who have consumed a good and are available to other individuals as they make decisions about which products to purchase these ratings have the potential to substantially improve the match between products and consumers however the extent to which they do so likely depends on whether the ratings reflect actual consumer experiences this paper evaluates one potential source of bias in consumer ratings mimicry of the reviews of experts using a rich dataset on consumer product ratings from the brewing industry and a regression discontinuity empirical framework i show that expert reviews influence consumer ratings consumer ratings fall in response to negative expert reviews and increase in response to positive expert reviews the results are most pronounced for strongly negative or strongly positive expert reviews this mimicry limits the extent to which information on product quality from actual consumer experiences diffuses to the population i suggest that nudges could be implemented to limit the extent to which mimicry affects ratings

expert opinion and the demand for experience goods an experimental approach in the retail wine market abstract the effect of expert opinion on demand for experience goods is difficult to quantify as the relationship between purchases and reviews may be driven by product quality further it is unclear whether a review based demand effect is due to providing quality or existence information using a retail field experiment to overcome these obstacles we find a significant positive average consumer response to expert opinion labels for wine demand decreases for low scoring wines and increases for wines scoring average or higher results indicate that expert opinion labels transmit quality information as opposed to solely shelf visibility

pennies from ebay the determinants of price in online auctions this paper presents an exploratory analysis of the determinants of prices in online auctions for collectible united states one cent coins at the ebay web site starting with an initial data set of 20 000 auctions we perform regression analysis on a restricted sample of 461 coins for which we obtained estimates of book value we have three major findings first a seller s feedback ratings reported by other ebay users have a measurable effect on her auction prices negative feedback ratings have a much greater effect than positive feedback ratings do second minimum bids and reserve prices have positive effects on the final auction price in particular minimum bids appear only to have a significant effect when they are binding on a single bidder as predicted by theory third when a seller chooses to have her auction last for a longer period of days this significantly increases the auction price on average

the dynamics of seller reputation evidence from ebay we construct a panel of ebay seller histories and examine the importance of ebay s reputation mechanism we find that when a seller first receives negative feedback his weekly sales rate drops from a positive 7 to a negative 7 subsequent negative feedback ratings arrive 25 more rapidly than the first one and don t have nearly as much impact as the first one we also find that a seller is more likely to exit the lower his reputation is and that just before exiting sellers receive more negative feedback than their lifetime average we consider a series of theoretical models and measure them against these empirical results regardless of which theoretical model best explains the data an important conclusion of our paper is that ebay s reputation system gives way to noticeable strategic responses from both buyers and sellers

the market for evaluations recent developments in computer networks have driven the cost of distributing information virtually to zero creating extraordinary opportunities for sharing product evaluations the authors present pricing and subsidy mechanisms that operate through a computerized market and induce the efficient provision of evaluations the mechanisms overcome three major challenges first evaluations which are public goods are likely to be underprovided second an inefficient ordering of evaluators may arise and third the optimal quantity of evaluations depends on what is learned from the initial evaluations

participation and investment decisions in a retirement plan the influence of colleagues choices abstract this paper investigates whether peer effects play an important role in retirement savings decisions we use individual data from employees of a large university to study whether individual decisions to enroll in a tax deferred account plan sponsored by the university and the choice of the mutual fund vendor for people who choose to enroll are affected by the decisions of other employees in the same department to overcome the identification problems we divide the departments into sub groups along gender status age and tenure lines and we instrument the average participation of each peer group by the salary or tenure structure in this group our results suggest that peer effects may be an important determinant of savings decisions

perceptions of institutional quality evidence of limited attention to higher education rankings abstract rankings of colleges and universities provide information about quality and potentially affect where prospective students send applications for admission we find evidence of limited attention to the popular u s news and world report rankings of america s best colleges we estimate that applications discontinuously drop by 2 6 when the rank moves from inside the top 50 to outside the top 50 whereas there is no evidence of a corresponding discontinuous drop in institutional quality notably the ranking of 50 corresponds to the first page cutoff of the printed u s news guides the choice of college is typically a one time decision with potentially large repercussions so students limited attention to rankings likely represents an irrational bias that negatively affects welfare

how segregated is urban consumption we provide measures of ethnic and racial segregation in urban consumption using yelp reviews we estimate how spatial and social frictions influence restaurant visits within new york city transit

learning from the crowd regression discontinuity estimates of the effects of an online review database internet review forums increasingly supplement expert opinion and social networks in informing consumers about product quality however limited empirical evidence links digital word of mouth to purchasing decisions we implement a regression discontinuity design to estimate the effect of positive yelp com ratings on restaurant reservation availability an extra half star rating causes restaurants to sell out 19 percentage points 49 more frequently with larger impacts when alternate information is more scarce these returns suggest that restaurateurs face incentives to leave fake reviews but a rich set of robustness checks confirm that restaurants do not manipulate ratings in a confounding discontinuous manner

gender differences in optimism and asset allocation we investigate two alternative explanations why men may hold more stocks than women do apart from the traditional explanation of a gender difference in risk aversion gender differences in either optimism or in perceived risk of financial markets might cause men to hold riskier assets our results show that men tend to be significantly more optimistic than women regarding a broad range of issues including the economy and financial markets after we take differences in optimism into account systematic gender differences in asset allocations disappear

i paid a bribe an experiment on information sharing and extortionary corruption abstract theoretical and empirical research on corruption has flourished in the last three decades however identifying successful anti corruption policies remains a challenge in this paper we ask whether bottom up institutions that rely on voluntary and anonymous reports of bribe demands such as the i paid a bribe website first launched in india in 2010 could act as effective anti corruption tools and if this is the case whether and how their effectiveness could be improved we overcome measurement and identification problems by addressing our research questions in the laboratory our results show that the presence of a reporting platform like the i paid a bribe website may be insufficient to systematically lower bribery a more effective platform is one where posts disclose specific information about the size of the bribes and the location of their requestors i e a platform that could serve as a search engine for the least corrupt officials especially if posting is restricted to service recipients our results also show that while citizens rarely post false information lying by officials when allowed to post on the platform is widespread

reputation and regulations evidence from ebay to mitigate inefficiencies arising from asymmetric information some markets rely on government interventions whereas others rely on reputation systems warranties or guarantees this paper explores the impact of two mechanisms namely reputation badges and buyer protection programs and their interaction on ebay s marketplace adding buyer protection reduces the premium for the reputation badge and increases efficiency in the marketplace these efficiency gains are achieved by reducing moral hazard through an increase in sellers quality and by reducing adverse selection through a higher exit rate for low quality sellers our estimates suggest buyer protection increases the total welfare by 2 9 this paper was accepted by matt shum marketing