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'And it’s not just profit; the concentration of corporate wealth shows up in a slew of other metrics.There were 4,819 public US companies in 1975. Forty years on, that number has fallen by more than a fifth, hitting 3,766 in 2015. This peculiar dwindling is but one of the dramatic changes in US public corporations described in a new study published in the Journal of Economic Perspectives. Of course, the bigger and richer the market Goliaths get, the harder it is for the Davids of the US economy to lethally bean them—and the need for R&D to compete may have exacerbated this. Companies drowning in cash can easily afford patents and the investments to develop those. Or, as seems to be happening, to buy the company with the patent. If you can’t beat Goliath, join him.'