This paper investigates the optimality of stock option grants to Chief Executive Officers (CEOs) by examining a set of S&P 500 companies around the passage of the Sarbanes–Oxley Act (SOX). I find that stock option grants to non-founding-family CEOs decreased dramatically after the passage of...

In this paper, we examine the relationship between volume and return volatility using the transaction data. We introduce transaction and volume imbalance measures to capture the information content of trades. These two information measures are shown to have a strong explanatory power for return...

Using a bivariate GARCH model, we examine patterns of information flows for three commodity futures traded in both the developed U.S. market and the emerging China market (copper, soybeans and wheat). For copper and soybeans, the two commodities that are subject to less government regulation and...