As the retail lobby intensifies its campaign against interchange fees, a handful of merchants are voluntarily paying even more of those fees by switching to "cards-only" policies.

Several large airlines have introduced "cashless cabins" in recent years, citing convenience, security and higher sales when people use plastic instead of cash to buy drinks, snacks or headphones during the flight. And though "cash-only" signs are much more common, a handful of restaurants continue to test "cards-only" policies — with mixed results — despite the increased interchange fees they must pay as a result.

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