The Self-Sufficiency Project (SSP) was a social experiment conducted in two Canadian provinces during the 1990s that tested a generous financial incentive program for welfare recipients. A little-known subsidiary experiment, called SSP Plus, had a three-way design that tested the incremental...

This article uses data from the National Child Development Survey on a cohort of individuals born in Great Britain during the first week of March 1958 to investigate whether educational attainment and labor force behavior 33 years later are affected by childhood behavioral problems that are...