Why High Earners Work Longer Hours "Between 1979 and 2002, the frequency of long work hours increased by 14.4 percentage points among the top quintile of wage

Why High Earners Work Longer Hours "Between 1979 and 2002, the frequency of long work hours increased by 14.4 percentage points among the top quintile of wage earners, but fell by 6.7 percentage points in the lowest quintile." http://www.nber.org/digest/jul06/w11895.html http://www.nber.org/digest/jul06/w11895.html