Yes, the higher-incomes work harder
No, higher-incomes don't work harder
You want to encourage a better work ethic, get rid of the hourly wage and give everyone a salary with bonus potential. Right now, its better for poor people to slack off to squeeze out a few hours extra a work to have that extra $20/week or so.
Hayek - too liberal for republicans
“In politics, stupidity is not a handicap.” -Napoleon