Our study is the first to investigate the implications of trading in options that expire on the same day - so-called "0DTE" options. Almost the entire growth of trading in S&P 500 index options can be traced back to demand for 0DTE options. We use recent exchange-related developments to identify...

Uncertainty and monetary policy decisions in the U.S. interact with one another. Contrary to the common notion that FOMC announcements resolve a non-trivial amount of economic uncertainty, we find that the announcement commands a sizable left-tail premium, which builds up a few days in advance....