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In [[finance]], a '''spread option''' is a type of [[Option (finance)|option]] where the payoff is based on the difference in price between two underlying assets. For example the two assets could be crude oil and heating oil; trading such an option might be of interest to oil refineries, whose profits are a function of the difference between these two prices. Spread options are generally traded over the counter, rather than on exchange.<ref>[http://www.global-derivatives.com/index.php/component/content/46?task=view Global Derivatives: Spread option]</ref><ref>[http://www.investopedia.com/terms/s/spreadoption.asp#axzz1xK58zM00 Investopedia:Spread option]</ref> | |||
A 'spread option' is not the same as an 'option spread'. A spread option is a new, relatively rare type of [[exotic option]] on two underlyings, while an option spread is a combination trade: the purchase of one (vanilla) option and the sale of another option on the same underlying. | |||
==Spread option valuation== | |||
For a spread call, the payoff can be written as <math>C = \max(0,S_1-S_2-K)</math> where S1 and S2 are the prices of the two assets and K is a constant called the strike price. For a spread put it is <math>P = \max(0,K-S_1+S_2)</math>. | |||
When K equals zero a spread option is the same as an option to exchange one asset for another. An explicit solution, [[Margrabe's formula]], is available in this case. | |||
In 1995 Kirk's Approximation,<ref>Kirk E. (1995); Correlation in the Energy Markets, in: Managing Energy Price Risk, Risk Publications and Enron, London, pp. 71–78</ref> a formula valid when K is small but non-zero was published. This amounts to a modification of the standard [[Black-Scholes]] formula, with a special expression for the sigma (volatility) to be used, which is based on the volatilities and the correlation of the two assets. | |||
The same year Pearson published an algorithm<ref>[http://papers.ssrn.com/sol3/papers.cfm?abstract_id=7010 N. Pearson: An efficient approach for pricing spread options]</ref> requiring a single numerical integration to compute the option value. | |||
This method was improved upon in 2006 when Li, Deng and Zhou<ref>Li, Deng and Zhou: Closed-Form Approximations for Spread Option Prices and Greeks [http://papers.ssrn.com/sol3/papers.cfm?abstract_id=952747]</ref> published accurate approximation formulas for both spread option prices and their Greeks. | |||
==References== | |||
{{Reflist}} | |||
{{DEFAULTSORT:Spread Option}} | |||
[[Category:Options (finance)]] | |||
[[Category:Derivatives (finance)]] | |||
{{finance-stub}} | |||
Revision as of 14:26, 29 January 2014
In finance, a spread option is a type of option where the payoff is based on the difference in price between two underlying assets. For example the two assets could be crude oil and heating oil; trading such an option might be of interest to oil refineries, whose profits are a function of the difference between these two prices. Spread options are generally traded over the counter, rather than on exchange.[1][2]
A 'spread option' is not the same as an 'option spread'. A spread option is a new, relatively rare type of exotic option on two underlyings, while an option spread is a combination trade: the purchase of one (vanilla) option and the sale of another option on the same underlying.
Spread option valuation
For a spread call, the payoff can be written as where S1 and S2 are the prices of the two assets and K is a constant called the strike price. For a spread put it is .
When K equals zero a spread option is the same as an option to exchange one asset for another. An explicit solution, Margrabe's formula, is available in this case.
In 1995 Kirk's Approximation,[3] a formula valid when K is small but non-zero was published. This amounts to a modification of the standard Black-Scholes formula, with a special expression for the sigma (volatility) to be used, which is based on the volatilities and the correlation of the two assets.
The same year Pearson published an algorithm[4] requiring a single numerical integration to compute the option value.
This method was improved upon in 2006 when Li, Deng and Zhou[5] published accurate approximation formulas for both spread option prices and their Greeks.
References
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- ↑ Global Derivatives: Spread option
- ↑ Investopedia:Spread option
- ↑ Kirk E. (1995); Correlation in the Energy Markets, in: Managing Energy Price Risk, Risk Publications and Enron, London, pp. 71–78
- ↑ N. Pearson: An efficient approach for pricing spread options
- ↑ Li, Deng and Zhou: Closed-Form Approximations for Spread Option Prices and Greeks [1]