A contract that permits one party to buy from (or sell to) the other party something at a prespecified price during a prespecified period of time, leaving the choice of whether to do this or not (whether to "exercise" the option) up to the first party, which buys the option. Options exist for many assets, including foreign exchange.
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inverted market
Fluctuation Limit
Discount arbitrage
underlying futures contract
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accounting equation
cost accumulation
London International Financial Futures and Options Exchange (LIFFE)