Abstract In both corporate finance and asset pricing empirical work, researchers are often confronted with panel data. In these data sets, the residuals may be correlated across firms and across time, and OLS standard errors can be biased. Historically, the two literatures have used different solutions to this problem. Corporate finance has relied on clustered standard errors, while asset pricing has used the Fama-MacBeth procedure to estimate standard errors. This paper examines the different methods used in the literature and explains when the different methods yield the same (and correct) standard errors and when they diverge. The intent is to provide intuition as to why the different approaches sometimes give different answers and give researchers guidance for their use.

The fraction of U.S. college graduate women entering professional programs increased substantially just after 1970, and the age at first marriage among all U.S. college graduate women began to soar around the same year. We explore the relationship between these two changes and the diffusion of the birth control pill ("the pill") among young, unmarried college graduate women. Although the pill was approved in 1960 by the Food and Drug Administration and spread rapidly among married women, it did not diffuse among young, single women until the late 1960s after state law changes reduced the age of majority and extended "mature minor" decisions. We present both descriptive time series and formal econometric evidence that exploit cross-state and cross-cohort variation in pill availability to young, unmarried women, establishing the "power of the pill" in lowering the costs of long-duration professional education for women and raising the age at first marriage. The careers of college graduate women and their age at first marriage both changed significantly in the United States with cohorts born around 1950. Women were 10 percent of first-year law students in 1970 We have benefited from conversations and communications with

This study examines the effect of an increase in product quality information to consumers on firms’ choices of product quality. In 1998, Los Angeles County introduced hygiene quality grade cards to be displayed in restaurant windows. We show that the grade cards cause (i) restaurant health inspection scores to increase, (ii) consumer demand to become sensitive to changes in restaurants ’ hygiene quality, and (iii) the number of foodborne illness hospitalizations to decrease. We also provide evidence that this improvement in health outcomes is not fully explained by consumers substituting from poor hygiene restaurants to good hygiene restaurants. These results imply the grade cards cause restaurants to make hygiene quality improvements.

Personal bankruptcy rates have increased significantly in the U.S. in the last 25 years. This paper is the first to document a link between credit supply factors and rising bankruptcy rates. We exploit the exogenous variation in market contestabil-ity brought on by banking deregulation — defined as the relaxation of bank entry restrictions in the 1980s and 1990s — at the state level. We find that deregulation explains at least 10 % of the rise in bankruptcy rates from 1980 to 1994. We also find that deregulation led to increased lending, lower loss rates on loans, and higher lending productivity – the average loan per bank employee. Our findings indicate that deregulation increased competition for borrowers and prompted banks to adopt more sophisticated credit rating technology, which allowed for new credit extension to both existing and previously excluded households.

Studies of public-private and foreign-domestic wage differentials face difficulties distinguishing ownership effects from correlated characteristics of workers and firms. This paper estimates these ownership differentials using linked employer-employee data (LEED) from Hungary containing 1.35mln worker-year observations for 21,238 firms from 1986 to 2003. We find that ownership type is highly correlated with characteristics of both workers (education, experience, gender, and occupation) and firms (size, industry, and productivity), suggesting ownership type is systematically selected along these dimensions. The large unconditional wage gaps (0.24 for public-private and 0.40 for foreign-domestic) in the data are little affected by conditioning on worker characteristics, but controlling for industry reduces the public and foreign premia (to 0.16 and 0.34, respectively), and controlling for employment size further reduces them (to 0.07 and 0.28). We also exploit the presence of 3,700 switches of ownership type in the data to estimate firm fixed-effects and random trend models, accounting for unobserved firm characteristics affecting the average level and trend growth of wages. These controls have little effect on the conditional public-private gap, but they reduce the estimated foreign premium (to 0.07). The results imply that the substantial unconditional wage differentials are mostly, but not entirely, a function of

Schaffer for econometric help and advice, and participants at presentations at the Upjohn Institute, Central European University, EERC-Kiev, and the 2005 AEA meetings for helpful comments. Assembling and preparing the data for this project involved large teams of collaborators, and we are grateful for conscientious work by Anna Horváth, Anna Lovász, Béla Személy, and Ágnes Törőcsik on the Hungarian data; Ioana Dan, Victor Kaznovsky, Catalin Pauna, Irina Vantu, and especially Ruxandra Visan on the Romanian data; and Natalia

At the time when at least two-thirds of the US states have already mandated some form of seller’s property condition disclosure statement and there is a movement in this direction nationally, this paper examines the impact of seller’s property condition disclosure law on the residential real estate values, the information asymmetry in housing transactions and shift of risk from buyers and brokers to the sellers, and attempts to ascertain the factors that lead to adoption of the disclosur law. The analytical structure employs parametric panel data models, semiparametric propensity score matching models, and an event study framework using a unique set of economic and institutional attributes for a quarterly panel of 291 US Metropolitan Statistical Areas (MSAs) and 50 US States spanning 21 years from 1984 to 2004. Exploiting the MSA level variation in house prices, the study finds that the average seller may be able to fetch a higher price (about three to four percent) for the house if she furnishes a state-mandated seller’s property

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We present a model of wage contract violation that implies a possibility of multiple equilibria in the level of arrears. Positive feedback arises because each employer's arrears affect the costs of late payment faced by other employers operating in the same labor market, resulting in a network externality or strategic complementarity in the adoption of the practice. We study the case of three equilibria, distinguishing two that are stable: the "punctual payment equilibrium " and the "late payment equilibrium. " Our econometric analysis of linked employer-employee data for Russia supports the model's contention that the firm's costs of wage arrears – as embodied in worker effort, quit and strike behavior, and the probability of legal penalties – are attenuated by arrears in the local labor market. We estimate the arrears reaction function implied by the model, showing that it exhibits strongly positive feedback, and that the theoretical conditions for multiple equilibria under symmetric local labor market competition are satisfied in 1995 and 1998. Simulation results imply a late payment equilibrium characterized by six monthly overdue wages for a typical worker in 1995 and nine in 1998.

Studies of public-private and foreign-domestic wage differentials face difficulties distinguishing ownership effects from correlated characteristics of workers and firms. This paper estimates these ownership differentials using linked employer-employee data (LEED) from Hungary containing 1.35mln worker-year observations for 21,238 firms from 1986 to 2003. We find that ownership type is highly correlated with characteristics of both workers (education, experience, gender, and occupation) and firms (size, industry, and productivity), suggesting ownership type is systematically selected along these dimensions. The large unconditional wage gaps (0.24 for public-private and 0.40 for foreign-domestic) in the data are little affected by conditioning on worker characteristics, but controlling for industry reduces the public and foreign premia (to 0.16 and 0.34, respectively), and controlling for employment size further reduces them (to 0.07 and 0.28). We also exploit the presence of 3,700 switches of ownership