If you did it right now, you would stick out like a sore thumb, and get a lot of customer resistance. If you do it when there's a good excuse ("it's the evil NRST that did it") and when others around you are also doing it, it's much easier.
That's why the Euro example is NOT Apples and Oranges. "It's the evil EU Euro that did it", and most others jacked the price, too.
It just takes one business trying to maximize profits by gaining market share to begin the process. If it were possible to have 100% of business collude in price fixing, it would be happening. It's not happening. The desire to maximize profits leads to the attempt to gain market share.
Uh huh and when Walmart doesn't drop their prices all those other companies will just ignore that opportunity to trumpet how they can beat Wal-Mart on price (and still maintain their profit margin.) Heheheh you are frickin hilarious.
Sorry but that ain't the way American businesses work.