What is true is that it is these people who spend the most and help economic growth. So they have a significant impact on the economy. And more often than not they are dual income families where both the husband and wife have decent paying jobs. 

The Republicans are going to create a economic recession. The Republicans said they would lower everybody's taxes. But their plans show that is a lie. These are the people that buy higher end products, go to restaurants, travel, employ professional contractors, pay for child care, pay for schools, etc. So Republicans are stupidly going to raise their taxes.