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Corporate concentration with larger companies, each more dominant in its industry, and fewer companies controlling half of U.S. corporate profits, are trends economists say that hurt wages, create income inequality, shrink the middle class and lead to less consumer welfare. About 30 companies control half of U.S. corporate profits in 2018 compared to 109 in 1975, according to economists at the University of Arizona.

Fewer companies in each industry mean less competition for workers, and less leverage for workers in setting wages. Apple Computer just reached the trillion dollar size and Amazon is close to doing this with its dominance in online shopping. Amazon is known for lower wages in its industry. Apple has some of the highest profit margins in  industry, and trends show the margins have risen between cost of making a product and price in an unprecedented way. The result is higher corporate profits and labor commanding a declining share of the nation's wealth.