From Greg Mankiw.

"David Henderson reports:

If the federal minimum wage were increased to $9.50 per hour:

•  Only 11.3 percent of workers who would gain from the increase live in households officially defined as poor.
•  A whopping 63.2 percent of workers who would gain were second or even third earners living in households with incomes equal to twice the poverty line or more.
•  Some 42.3 percent of workers who would gain were second or even third earners who live in households that have incomes equal to three times the poverty line or more."