future delivery, but where in fact none is ever intended or executed. The nominal seller does not have or expect to have the stock or merchandise he purports to sell, nor. does the nominal buyer expect to receive it or to pay the price. Instead of that, a percentage or margin is paid, which is increased or diminished as the market rates go up or down, and accounted for to the buyer. King v. Quidnick Co., 14 R. I. 1388; Lemonfus v. Mayer, 71 Miss. 514. 14 South. 33;