If poor people work hard, they will succeed. They may not necessarily be an engineer working for IBM but they can make a lot of money as a plumber. Just ask Joe.
Smart people figure out that by working hard they will get ahead. Dumb people just can't see the correlation between hard work and success. When I say "smart" I mean they are not stupid.....they don't have to be very smart to see how to get out of their predicament.
My point is that the Bell Curve demonstrated that people with similar IQs receive similar compensation for comparable work.