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...

The 1996 welfare reform law called for profound changes in welfare policy, including a five-year time limit on federally funded cash assistance (known as Temporary Assistance for Needy Families, or TANF), stricter work requirements, and greater flexibility for states in designing and managing...