Decades ago there was a segment on the 60 Minutes news show about distributors being restricted to selling only sodas made by Coke. Pepsi did the same thing. So grocery stores had to deal with two distributors instead of one. But it was more of a problem for the distributors. You'll also notice that when you go into a fast food place you can order Coke sodas, but not Pepsi sodas, or vice versa.
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