"You can't make it if you can't sell it". And, "You can't sell it if there is a lack of ready willing and ABLE buyers". So, when incomes and wealth become totally skewed to a tiny minority the economy falters. Back in the 60s when blue collar workers make decent incomes the economy was the envy of the world. They went out and purchased what the economy produced. No so much so today as the middle class has shrunk due to globalization, excessive immigration, the decline of a unionized labor force and the effect of largely Republican economic policy which has shifted the tax burden of the nation from the wealthy to the middle class.