This article proposes a general class of joint and marginal diagnostic tests for parametric conditional mean and variance models of possibly nonlinear non-Markovian time series sequences. The use of joint and marginal tests is motivated from the fact that marginal tests for the conditional...

We examine the short-run dynamic relation between daily institutional trading and stock price volatility in a retail investor-dominated emerging market. We find a significantly negative relation between volatility and institutional net trading that is mainly due to the unexpected institutional...

This study provides evidence that short selling influences the disclosure of bad news by firms. Managers have incentives to withhold or delay the release of bad news. As informed traders, short sellers enhance the informativeness of stock prices, especially related to bad news, potentially...