A derivative security whose value is determined by whether an underlying instrument will trade above or below a given price at or by a given time. The price of the underlying instrument in the inventive instrument must move a certain amount in a certain direction in a limited amount of time. If it does, that trade yields a fixed amount of money for the acceptor of the contract (510, 545). If it does not, that acceptor loses the premium lie paid for the contract (510, 545).