Lottery estimates suggest oversubscribed urban charter schools boost student achievement markedly. But these estimates needn't capture treatment effects for students who haven't applied to charter schools or for students attending charters for which demand is weak. This paper reports estimates...

A growing number of school districts use centralized assignment mechanisms to allocate school seats in a manner that reflects student preferences and school priorities. Many of these assignment schemes use lotteries to ration seats when schools are oversubscribed. The resulting random assignment...

In 2005, the U.S. Congress legislated that the H-1B visa program create 20,000 annual slots reserved for advanced-degree applicants. Since then, the U.S. Customs and Immigration Service (USCIS) has used visa allocation rules that comply with this legislation. Following a directive in the April...