Until the late '70s-early '80s, overall productivity tracked very closely with wage growth.

Then wage growth flattened out, at the same time that the wealth of the wealthiest few started to grow by leaps and bounds.

It is the fault of people accruing capital. They have taken a vast percentage of all the wealth created in the past 50 years, which would have otherwise gone to the rest of us.

Then they used that wealth as leverage to prevent the rest of us from having the power to do anything about it.