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dsr_ • today at 4:02 AM • 1 reply • view on HN

Even without outright collusion, a market without at least seven viable suppliers is not really competitive. Current "monopoly" policy is corrupt.

(Seven has been experimentally determined, but I can't recall where.)


Replies

gavmor • today at 4:32 AM

I was curious, so I looked this up: Section 5.3 of the 2010 U.S. merger-guideline explicitly classified markets with a Herfindahl–Hirschman Index below 1,500 as “unconcentrated.”

I can't quote the formula here, but HHI is, apparently, the sum of squared percentage market shares. Six equal-sized suppliers give an HHI of approximately 1,667, while seven give approximately 1,429—on opposite sides of the 2010 threshold.

Is that where you got the number?