In his new book, Casey Mulligan focuses on how an expanded array of U.S. safety-net programs, such as food stamps, unemployment insurance, Medicaid, and housing/mortgage assistance programs, raised effective marginal income-tax rates especially for poor families.
These diminished incentives to work contributed to the weakness of the U.S. economic recovery since the end of the recession in 2009 and also explain why Barack Obama is justifiably called the "Food-Stamp President".