Firms in industry clusters have market prices that are more efficient than firms outside clusters. To establish causality, we analyze exogenous firm relocations and find that firms that relocate into industry clusters have higher levels of industry-information in their prices. We argue that...

We investigate whether implied volatility comovements reflect the degree to which a firm’s private information is informative about future macroeconomic news. We compute IVC, the comovement of the implied volatilities between the firm and the aggregate market. IVC measures the extent to which...

This paper examines the implications of the option value of equity for firms' disclosures. Merton (1974) shows that the equity of levered firms is equivalent to a call option whose value increases in the expected variance of future cash flows. I use this equivalence to calculate firms' vega,...

We develop a measure of how information events impact investors' expectations of risk. The measure is broadly applicable and simple to implement. We derive it from an option-pricing model, where investors anticipate an announcement that simultaneously conveys information on the announcer's...

We develop and implement a new measure of information asymmetry among traders. Our measure is based on the intuition that informed traders are more likely than uninformed traders to generate abnormal volume in options or stock markets. We formalize this intuition theoretically and compute the...

We develop a measure of how information events impact investors' perceptions of risk that is broadly applicable and simple to implement. We derive this measure from an option-pricing model where investors anticipate an announcement that simultaneously conveys information on the announcer's...