Call for delivery of an asset (or, in some cases, its cash value) at a specified delivery or maturity date, for an agreed-upon price, called the futures price, to be paid at contract maturity. A call option is a right to purchase an asset at a stipulated exercise price on or before an expiration date. A put option is the right to sell an asset at some exercise price. Calls increase in value, while puts decrease in value, as the price of the underlying asset increases. A futures contract is an obligation to buy or sell an asset at a stipulated futures price on a maturity date. The long position, which commits to purchasing, gains if the asset value increases, while the short position, which commits to delivering the asset, loses.