Glossary of Investment Terms: K
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A measure of the sensitivity of the price of an option to a change in its implied volatility.
Key currency
Small countries, which are highly dependent on exports, orientates their currencies to their major trading partners, the constituents of a currency basket.
Kiwi
Slang for the New Zealand dollar.
Knock In
A process where a barrier option (European) becomes active as the underlying spot price is in the money. Knock out has a corresponding meaning although the option may permanently cease to exist.