This means that the other 80% of Americans represent only 37% of the spending done today. If a company is looking to maximize profits the typical path is to do so by marketing to the group where they could earn the most money. That is less and less the bottom 80% of Americans.
Its mostly already arrived.
“As of June 30, the top 20% of earners accounted for more than 63% of all spending”
source
This means that the other 80% of Americans represent only 37% of the spending done today. If a company is looking to maximize profits the typical path is to do so by marketing to the group where they could earn the most money. That is less and less the bottom 80% of Americans.
But the top 20% can still spend. That number is going to drop off a cliff when the stock market tumbles, and the spending with it.