I got it from history. It looks as if you haven't studied history and economics. What triggered the great depression was that the U.S. wanted to promote more businesses to sell their products to Americans, and the rose the taxes to the imports. So, the other countries did the same, and that reduced trading.

Also, the base to a good paying job is a good education. Good education in anything is good. Per say, if someone graduates as an architect, that person can create an architecture firm or work for one.

But to do that, an average C or B student cannot do it if they don't have the money to pay the thousands of dollars that the Universities ask for.