The act of exercising an option to sell the underlying asset, or an option that confers upon the holder the right to sell the underlying asset to the option's writer - but not the obligation to do so - at a specified price and by a certain date. In the forex options market, a put on the Base Currency is also a call on the counter currency since currencies trade in pairs.
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put/call ratio
Ratio Calendar Spread
Ratio Calendar Combination
equity accounting
exotic option
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