We assess the presence and nature of strategic trading by informed investors in the options market. Specifically, we develop and test a model for the spread of an option that directly captures the effects of strategic trading by informed traders. We show that the underlying stock's spread has an...

We develop a set of time series restrictions on the joint distribution of returns on factor-mimicking portfolios and returns on financial assets. We show that, under reasonable conditions, a factor is a legitimate candidate if it is strongly exogenous in the Engle-Hendry-Richard (1983)-sense, or...

In this paper, we develop a new approach to test whether momentum is indeed an anomaly in that it reflects delayed reactions, or continued overreactions, to firm specific news. Our methodology does not depend on a specific model of expected returns and, more importantly, does not require a...

In this study, we model and measure the existence of informed trading. Specifically, we investigate the properties of the widely used measure of informed trading, PIN, developed by Easley and O'Hara, and establish three important features of informed trading. First, the existence of informed...