There are tremendous differences in what it takes for workers to get by in different parts of the country.
Given the differences in housing and living costs across U.S. metros, a single national rate makes little sense.
How much would it take to make that possible again?
The mayor says it's $14.15 (or £8.80) per hour, but has no plans to introduce legislation to force employers to pay it.
D.C. Mayor Vincent Gray just vetoed a measure that would have effectively established two very different minimum wages in the city.
A delicate calculation.