I can sum this up in one simple answer that actually represents a whole bunch of extremely complex issues: It's because of the methods we've used here in the United States of America to deal with the basic limitations of the human condition.
One case in point is this: There is an enormous difference between what a typical person is willing to pay for a product or service and what that same person would charge to work in carrying out the production of that product or service.
This is why we import so many things from overseas, and why we allow illegal aliens to flood this country . . . because foreigners will do this work for far less than we would ever do it ourselves.
This is also why we have engaged in this pathological idiocy of running up massive government and personal debts on all levels . . . because our standard of living is so unsustainable that passing on the cost to future generations is the only way to pay for it.
BS. This is elitist code for Americans are lazy and stupid, a justification. Pure crapola.