That's been tanking for at least the last eight years. That's why the average American is so pissed!
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Here is the GDP per capita data. Generally speaking improvements in GDP per capita equate to a better average standard of living.
I suppose it could be different this time. We had a big setback in 2008-2009 but since then the GDP has been on the upswing. That despite the Dems working hard to suppress it with their never ending rules, regulations, taxes and fees.