The people in power do everything they can to keep wages down. Minimum wage doesn't keep up with inflation. Pensions went away in favor of the 401(k). Unions are losing their power. A manufacturing job used to buy you a house, car, and help you raise your 2.5 children. Now, it barely gets you an apartment and a bus pass.
But the real exploitation is how the rich have convinced the poor that it's not their fault. "It's those damn, dirty Mexicans stealing jobs!" Or telling them "Hey, we'll give you a pay raise if you give us some tax relief!" or that if they want the house, they need to get a real job or something like that. Manufacturing jobs are non-skilled and don't deserve anything over minimum wage!
Of course, it's all lies, but some people eat that shit up like candy. That's the exploitation. They're fucking the poor and successfully directing the blame somewhere else.