This issue of the Journal of Financial Economics contains the first set of studies in the new Clinical Papers section. The objective of this section is to provide a high-quality professional outlet for scholarly studies of specific cases, events, practices, and specialized applications. By...

"This paper uses monthly returns from 1802-2010, daily returns from 1885-2010, and intraday returns from 1982-2010 in the United States to show how stock volatility has changed over time. It also uses various measures of volatility implied by option prices to infer what the market was expecting...