Forex Options
The Forex Put Option - A foreign exchange put option gives the foreign exchange options buyer the right, but not the obligation, to sell a specific foreign exchange spot contract (the underlying) at a specific price (the strike price) on or before a specific date (the expiration date). The amount the foreign exchange option buyer pays to the foreign exchange option seller for the foreign exchange option contract rights is called the option "premium."
Please note that "puts" and "calls" are separate foreign exchange options contracts and are NOT the opposite side of the same transaction. For every foreign exchange put buyer there is a foreign exchange put seller, and for every foreign exchange call buyer there is a foreign exchange call seller. The foreign exchange options buyer pays a premium to the foreign exchange options seller in every option transaction.
Plain Vanilla Forex Options - Plain vanilla options generally refer to standard put and call option contracts traded through an exchange (however, in the case of forex option trading, plain vanilla options would refer to the standard, generic forex option contracts that are traded through an over-the-counter (OTC) forex options dealer or clearinghouse). In simplest terms, vanilla forex options would be defined as the buying or selling of a standard forex call option contract or a forex put option contract.
Exotic Forex Options - To understand what makes an exotic forex option "exotic," you must first understand what makes a forex option "non-vanilla." Plain vanilla forex options have a definitive expiration structure, payout structure and payout amount. Exotic forex option contracts may have a change in one or all of the above features of a vanilla forex option. It is important to note that exotic options, since they are often tailored to a specific's investor's needs by an exotic forex options broker, are generally not very liquid, if at all.
Intrinsic & Extrinsic Value - The price of an FX option is calculated into two separate parts, the intrinsic value and the extrinsic (time) value.
The intrinsic value of an FX option is defined as the difference between the strike price and the underlying FX spot contract rate (American Style Options) or the FX forward rate (European Style Options). The intrinsic value represents the actual value of the FX option if exercised. Please note that the intrinsic value must be zero (0) or above - if an FX option has no intrinsic value, then the FX option is simply referred to as having no (or zero) intrinsic value (the intrinsic value is never represented as a negative number). An FX option with no intrinsic value is considered "out-of-the-money," an FX option having intrinsic value is considered "in-the-money," and an FX option with a strike price at, or very close to, the underlying FX spot rate is considered "at-the-money."
The extrinsic value of an FX option is commonly referred to as the "time" value and is defined as the value of an FX option beyond the intrinsic value. A number of factors contribute to the calculation of the extrinsic value including, but not limited to, the volatility of the two spot currencies involved, the time left until expiration, the riskless interest rate of both currencies, the spot price of both currencies and the strike price of the FX option. It is important to note that the extrinsic value of FX options erodes as its expiration nears. An FX option with 60 days left to expiration will be worth more than the same FX option that has only 30 days left to expiration. Because there is more time for the underlying FX spot price to possibly move in a favorable direction, FX options sellers demand (and FX options buyers are willing to pay) a larger premium for the extra amount of time.
Volatility - Volatility is considered the most important factor when pricing forex options and it measures movements in the price of the underlying. High volatility increases the probability that the forex option could expire in-the-money and increases the risk to the forex option seller who, in turn, can demand a larger premium. An increase in volatility causes an increase in the price of both call and put options.
Delta - The delta of a forex option is defined as the change in price of a forex option relative to a change in the underlying forex spot rate. A change in a forex option's delta can be influenced by a change in the underlying forex spot rate, a change in volatility, a change in the riskless interest rate of the underlying spot currencies or simply by the passage of time (nearing of the expiration date).
The delta must always be calculated in a range of zero to one (0-1.0). Generally, the delta of a deep out-of-the-money forex option will be closer to zero, the delta of an at-the-money forex option will be near .5 (the probability of exercise is near 50%) and the delta of deep in-the-money forex options will be closer to 1.0. In simplest terms, the closer a forex option's strike price is relative to the underlying spot forex rate, the higher the delta because it is more sensitive to a change in the underlying rate.
