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

A Metrorail commuter uses a fare machine at a station in Washington, DC, on October 24, 2018. - As the US capital traded stifling summer heat for cool autumn breezes, signs began appearing on lamp posts, asking Washington commuters: what do you think about buses going cash-free? It was the latest iteration of a growing trend in the United States: from lunch spots to music venues and vendors at the city's ballpark, one Washington business after another are completely ditching paper for plastic. (Photo by Jim WATSON / AFP)

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.