Personally, I think it is the shop owners discretion.
I will admit that I am annoyed with the current trend of using debit/credit cards for low dollar purchases at convienance stores.
I will also say that, IMHO, you should ALWAYS try and have at least $50 in cash on your person. Cash is KING, not every biz accepts the devils buisness card!
Sorry, this is incorrect. See below.
I have been down this road a few times. Here is the facts.
Master Card and Visa has an agreement with the merchants that state the following.
1. You must accept the card without question as long as it is signed and accepted at the POS. No identification required.
2. There can not be any minimum purchase or other requirements.
3. You can not charge extra for use of the card. (Note: A discount for cash may be offered, but a surcharge for card use is forbidden).
I have had a problem with a specific merchant and written MC about two of those violations. Both times MC has contacted the merchant and corrected the problem.
NOTE: These rules DO NOT apply to Discover Card.
100% accurate. I worked at North American Bancard in Michigan, in tech support. It is indeed a violation of both Visa and Mastercard's contracts to set a minimum charge and/or charge an extra fee. The fine varies by contract, I do believe, however I saw a store in Michigan that continued this policy after being warned. At this point Visa charged them $1000 per complaint, and proven claim, that the store was charging an access fee. The store had 100 complaints. You do the math. Consequently, they lost their Visa contract.
Call your card services department and file a complaint. Then, have fellow INGOers go in there in droves and when turned away for the minimum policy, have THEM complain. The store will get the point REAL quick.