This paper establishes a new fact about the compositional changes in the pool of unemployed over the U.S. business cycle. Using micro-data from the Current Population Survey for the years 1962-2012, it documents that in recessions the pool of unemployed shifts towards workers with high wages in their previous job. These shifts are associated with both observed and unobserved factors in the wage...

Vomiting and abdominal pain are symptoms that may arise from a number of different causes. Cyclical vomiting and abdominal migraine are terms that have been applied to a presentation characterized by its episodic pattern and intervals of complete health. The 2 share many clinical features, but it is important to distinguish them as they have different responses to therapies such as prophylactic...