A system, method, and corresponding computer program product facilitates trading of a standardized contract. The terms of the contract may be such that it provides a payout from one party to the other based on the price, yield, level or other measure of an asset, basket, index, financial contract, other financial instrument or some economically significant variable observed at or around two specified times, both such times being after the time that the standardized contract is first available for trading. Alternatively, the terms of the contract may be such that it provides that one party has the right but not the obligation either to purchase or to sell some asset at a price which is determined at a first specified time, such right to be exercised at some time not later than the second specified time, both such times being after the time that the standardized contract is first available for trading. These and other related contracts are described.