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Why would a restaurant offer a very large cash discount?
This could be a case of the new chip card technology and dealing with slow reimbursement turnaround time. I recently visited a restaurant who was not using the chip technology, and it refused my card after several attempts. I found out from my bank it was because the restaurant was not set up for chip and I had not eaten there before....I know at the other end it takes far longer for the funds to get to the merchant; banks don't want to part with other people's money.