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It is a warning buried at the end of the International Monetary Fund's report on the American economy.

And it comes not from a protest group or a campaigning organisation, but a body built to foster the globalised, market economy.

The IMF is not renowned for being rammed full of anti-capitalist agitators.

So the question it raises might surprise a few people.

Are some businesses just too dominant, too big, for the overall good of the economy?

And has their growth exacerbated the decade long trend where the return on assets (in this case shares) has outstripped the return on labour (the income we receive for working).

More from Kamal Ahmed here.