I remember in the 1930s going to Coney Island in the summer. The subway ride was a nickel. Teenage boys would buy Eskimo Pies and ices and sell them on the beach out of big ice chests. They would go along the water’s edge where people bought ice cream. But the boys were competing with vendors who had stands on the boardwalk so the cops were forever chasing them away.  The boys would run off, but when the coast was clear(!) they came back to sell more ice cream.