Comment: they already do charge more

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In reply to comment: I use a credit card... (see in situ)

they already do charge more

to cover their 3% credit card fee. The only difference will be the fee won't be hidden in the price anymore. If they go ahead with this then it will encourage use of cash. However, many merchants won't add it on because it won't be popular with customers. On the other hand, some might use it to lower their prices so they *look* less expensive than their competitor. I'll hope for that and then pay cash.