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In finance, a foreign exchange option (commonly shortened to just FX option or currency option) is a derivative financial instrument that gives the right but not the obligation to exchange money denominated in one currency into another currency at a pre-agreed exchange rate on a specified date.〔"(Foreign Exchange (FX) Terminologies: Forward Deal and Options Deal )" Published by the (International Business Times AU ) on February 14, 2011.〕 See Foreign exchange derivative. The foreign exchange options market is the deepest, largest and most liquid market for options of any kind. Most trading is over the counter (OTC) and is lightly regulated, but a fraction is traded on exchanges like the International Securities Exchange, Philadelphia Stock Exchange, or the Chicago Mercantile Exchange for options on futures contracts. The global market for exchange-traded currency options was notionally valued by the Bank for International Settlements at $158.3 trillion in 2005. ==Example== For example, a GBPUSD contract could give the owner the right to sell £1,000,000 and buy $2,000,000 on December 31. In this case the pre-agreed exchange rate, or strike price, is 2.0000 USD per GBP (or GBP/USD 2.00 as it is typically quoted) and the notional amounts (notionals) are £1,000,000 and $2,000,000. This type of contract is both a call on dollars and a put on sterling, and is typically called a ''GBPUSD put'', as it is a put on the ''exchange rate''; although it could equally be called a ''USDGBP call''. If the rate is lower than 2.0000 on December 31 (say at 1.9000), meaning that the dollar is stronger and the pound is weaker, then the option is exercised, allowing the owner to sell GBP at 2.0000 and immediately buy it back in the spot market at 1.9000, making a profit of (2.0000 GBPUSD – 1.9000 GBPUSD) *1,000,000 GBP = 100,000 USD in the process. If they immediately convert the profit into GBP this amounts to 100,000/1.9000 = 52,631.58 GBP. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Foreign exchange option」の詳細全文を読む スポンサード リンク
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