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spread trade
In finance, a spread trade (also known as relative value trade) is the simultaneous purchase of one security and sale of a related security, called legs, as a unit. Spread trades are usually executed with option (finance)epends on the difference between the prices of the legs. Common spreads are priced and traded as a unit on futures exchanges rather than as individual legs, thus ensuring simultaneous execution and eliminating the execution risk of one leg executing but the other failing.
Spread trades are executed to attempt to profit from the widening or narrowing of the spread, rather than from movement in the prices of the legs directly. Spreads are either "bought" or "sold" depending on whether the trade will profit from the widening or narrowing of the spread.
==Margin==
The volatility of the spread is typically much lower than the volatility of the individual legs, since a change in the market fundamentals of a commodity will tend to affect both legs similarly. The margin requirement for a futures spread trade is therefore usually less than the sum of the margin requirements for the two individual futures contracts, and sometimes even less than the requirement for one contract.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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