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This is nation-wide to some 10 million customers.

For your alternative explanation to be true, it would require that all the 8 retail chains would have the exact same margin by natural, fair chance - and, cumulatively by fair chance, increment prices by exactly the same amount, at exactly the same time...

Better play the lottery.

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Why "natural, fair chance"? Of course they see what their competitors charge. That's one of the ingredients of a free market. The quicker they react, the quicker the information is dissipated in the free market.

That is an aspect of alleged price fixing for consumer products I never got.

It's trivial for every large retail store to just send someone to look at their competitor's prices and price at the same mark.

This is not feasible to do for B2B only products, such as bulk LCD panels, so it's a lot easier to prove pre-arranged price-fixing.

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