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Washington embraces cash-free living — but at what cost?

WASHINGTON: As the US capital traded stifling summer heat for cool autumn breezes, signs began appearing at bus stops, asking Washington commuters: what do you think about buses going cash-free? Salad lunch spot Sweetgreen doesn't take greenbacks. Neither do certain vendors at Nationals Park like Ben's Chili Bowl, a local eatery popular with baseball fans. Slowly, DC businesses are ditching paper money for plastic, embracing a trend gaining traction nationwide. "I'm all for the cash-free system" on buses, Rogers…