Market share in 2009:
Hachette 10%
HarperCollins 9.8%
Macmillan 5.4%
Penguin 11.3%
Random House 17.5%
Simon & Schuster 9.1%
TOTAL 63%
They publish over 80% of NYT Best Sellers.
The alleged collusion of switching to agency pricing at the same time doesn't make them a cartel. They aren't dividing up market share, setting total output, divvying up territories and authors and customers, dividing profits amongst themselves. They also aren't collectively trying to squeeze out smaller publishers.
I.e. we're not talking about DeBeers here.
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