TECHNICAL EFFICIENCY IN PRODUCTION IN A DEVELOPING COUNTRY: AN EMPIRICAL EXAMINATION OF THE BRAZILIAN PLASTICS AND STEEL INDUSTRIES

This paper estimates firm specific indexes of technical efficiencyfor the Brazilian plastics and steel industries. Two differentindexes are employed for the empirical estimates—the Farrellindex and an index developed from a linear programming approximationof a nonstochastic frontier production function specified inthe Cobb-Douglas functional form. Evidence of substantial relativetechnical inefficiency is revealed. In both industries onlya very small proportion of all the observed firms were producingamounts of output greater than 80 percent of that technicallypossible on the estimated frontier. Relative efficiency of thefirms in the two industries was not seen to be significantlyrelated to ownership (foreign or government), but tests didsuggest a tendency for larger firms, possessing larger marketshares, to be closer to the frontier than smaller firms.     

The effect of cookery method on beef palatability and cooking properties

A total of 432 boneless beef loin steaks were prepared using three different cookery methods (conventional electric oven, electric convection oven and microwave oven) and evaluated for palatability by an experienced six-member laboratory taste panel. Cooking losses and times were also recorded. Composite results indicate that microwave cookery can not be utilized to shorten cooking times without compromising the eating quality, but that preparation time can be substantially reduced (66%) without compromising eating quality by using convection rather than conventional cookery methods, under the conditions in which this study was conducted.     

The Delisting Bias in CRSP Data

I document a delisting bias in the stock return data base maintained by the Center for Research in Security Prices (CRSP). I find that delists for bankruptcy and other negative reasons are generally surprises and that correct delisting returns are not available for most of the stocks that have been delisted for negative reasons since 1962. Using over-the-counter price data, I show that the omitted delisting returns are large. Implications of the bias are discussed.     

Ex‐Dividend Profitability and Institutional Trading Skill

We use institutional trading data to examine whether skilled institutions exploit positive abnormal ex‐dividend returns. Results show that institutions concentrate trading around certain ex‐dates, and earn higher profits around these events. Dividend capture trades represent 6% of all institutional buy trades but contribute 15% of overall abnormal returns. Institutional dividend capture trading is persistent. Institutional ex‐day profitability is also strongly cross‐sectionally related to trade execution skill. The relation between execution skill and profits disappears around placebo non‐ex‐days. Results suggest that skilled institutions target certain opportunities rather than benefiting uniformly over time. Furthermore, only skilled institutions can profit from dividend capture.     

Volatility‐Managed Portfolios

Managed portfolios that take less risk when volatility is high produce large alphas, increase Sharpe ratios, and produce large utility gains for mean‐variance investors. We document this for the market, value, momentum, profitability, return on equity, investment, and betting‐against‐beta factors, as well as the currency carry trade. Volatility timing increases Sharpe ratios because changes in volatility are not offset by proportional changes in expected returns. Our strategy is contrary to conventional wisdom because it takes relatively less risk in recessions. This rules out typical risk‐based explanations and is a challenge to structural models of time‐varying expected returns.     

Do Behavioral Biases Affect Prices?

This paper documents strong evidence for behavioral biases among Chicago Board of Trade proprietary traders and investigates the effect these biases have on prices. Our traders appear highly loss‐averse, regularly assuming above‐average afternoon risk to recover from morning losses. This behavior has important short‐term consequences for afternoon prices, as losing traders actively purchase contracts at higher prices and sell contracts at lower prices than those that prevailed previously. However, the market appears to distinguish these risk‐seeking trades from informed trading. Prices set by loss‐averse traders are reversed significantly more quickly than those set by unbiased traders.