[expatpat]

Doesn't require any collusion -- A is happy with his new price, B sees that A is sticking with it and is happy with his price, C sees.......

When the Euro switched in for Local Currency in Europe, businesses took advantage of the cover and jacked up prices. They didn't come down again, and consumers are still bitching about it in Germany, Italy, and Greece.

[Phantom Lord]

Doesn't require any collusion -- A is happy with his new price, B sees that A is sticking with it and is happy with his price, C sees.......

And small company D wanting to gain market share drops the price forcing A, B, and C to follow suit or lose market share quickly and substantially to D.