Using Generalized Method of Moments to Test Mean-Variance Efficiency

This paper develops tests of unconditional mean-variance efflciency under weak distributional assumptions using a Generalized Method of Moments framework. These tests are potentially more robust than commonly employed tests which rely on the assumption that asset returns are normally distributed and temporarily i.i.d. Using returns for size-based portfolios from 1926 to 1988 we show that the conclusion concerning the mean-variance effilciency of market indexes can be sensitive to the test considered.     

On the Importance of Measuring Payout Yield: Implications for Empirical Asset Pricing

We investigate the empirical implications of using various measures of payout yield rather than dividend yield for asset pricing models. We find statistically and economically significant predictability in the time series when payout (dividends plus repurchases) and net payout (dividends plus repurchases minus issuances) yields are used instead of the dividend yield. Similarly, we find that payout (net payout) yields contains information about the cross section of expected stock returns exceeding that of dividend yields, and that the high minus low payout yield portfolio is a priced factor.     

Dynamic Competition,Valuation, and Merger Activity

We model the interactions between product market competition and investment valuation within a dynamic oligopoly. To our knowledge, the model is the first continuous‐time corporate finance model in a multiple firm setting with heterogeneous products. The model is tractable and amenable to estimation. We use it to relate current industry characteristics with firm value and financial decisions. Unlike most corporate finance models, it produces predictions regarding parameter magnitudes as well their signs. Estimates of the model's parameters indicate strong linkages between model‐implied and actual values. The paper uses the estimated parameters to predict rivals’ returns near merger announcements.     

Firing Costs and Capital Structure Decisions

I exploit the adoption of state‐level labor protection laws as an exogenous increase in employee firing costs to examine how the costs associated with discharging workers affect capital structure decisions. I find that firms reduce debt ratios following the adoption of these laws, with this result stronger for firms that experience larger increases in firing costs. I also document that, following the adoption of these laws, a firm's degree of operating leverage rises, earnings variability increases, and employment becomes more rigid. Overall, these results are consistent with higher firing costs crowding out financial leverage via increasing financial distress costs.     

Investor Tax Credits and Entrepreneurship: Evidence from U.S. States

Angel investor tax credits are used globally to spur high-growth entrepreneurship. Exploiting their staggered implementation in 31 U.S. states, we find that they increase angel investment yet have no significant impact on entrepreneurial activity. Two mechanisms explain these results: crowding out of alternative financing and low sensitivity of professional investors to tax credits. With a large-scale survey and a stylized model, we show that low responsiveness among professional angels may reflect the fat-tailed return distributions that characterize high-growth startups. The results contrast with evidence that direct subsidies to firms have positive effects, raising concerns about promoting entrepreneurship with investor subsidies.     

Reusing Natural Experiments

After a natural experiment is first used, other researchers often reuse the setting, examining different outcome variables. We use simulations based on real data to illustrate the multiple hypothesis testing problem that arises when researchers reuse natural experiments. We then provide guidance for future inference based on popular empirical settings including difference-in-differences, instrumental variables, and regression discontinuity designs. When we apply our guidance to two extensively studied natural experiments, business combination laws and the Regulation SHO pilot, we find that many results that were statistically significant using single hypothesis testing do not survive corrections for multiple hypothesis testing.     

Liquidity Requirements,Free-Riding,and the Implications for Financial Stability Evidence from the Early 1900s

Maintaining sufficient liquidity in the financial system is vital for its stability. However, since returns on liquid assets are typically low, individual financial institutions may seek to hold fewer such assets, especially if they believe they can rely on other institutions for liquidity support. We examine whether state banks in the early 1900s took advantage of relatively high cash balances maintained by national banks, due to reserve requirements, to hold less cash themselves. We find that state banks did hold less cash in places where both state legal requirements were lower and national banks were more prevalent.