On 10/2/2011 10:31 AM, Notat Home wrote:

In the US, when a merchant signs up to take credit cards, he signs a
contract that he will not give a discount for cash sales. A few may, but
they are in breach of their contract.

Wrong. They sign a contract that they will not have a surcharge for
credit card sales. It's actually different. The posted price is what a
credit card user pays. A cash customer can get a discount--sometimes.