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Arbitrage - the Key to Pricing Options

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January 1, 2004

Federal Reserve Bank of Cleveland

Arbitrage: The Key to Pricing Options by Ed Nosal and Tan Wang

A

rbitrage is the act of simultaneously buying and selling assets or commodities in an attempt to exploit a profitable opportunity. Although the idea behind arbitrage is fairly simple, it is quite powerful because the ability to exploit such opportunities is needed for markets to operate efficiently. Arbitrage ensures, for example, that buyers and sellers of foreign exchange can be assured that they are getting the “correct” rates for the currencies they are buying and selling independent of the national foreign-exchange markets they happen to be using.
When markets are efficient, the prices of the objects being traded reflect their true value. And having prices reflect true values is important in decentralized economies, such as the United States, since it is the relative prices of various goods, services, and assets that determines how many will be produced, how they will be allocated, and how funds will be invested. If prices did not reflect true value, then the resulting allocation of goods, services, and investment would not be, in general, economically efficient.
This Commentary focuses on a particular episode in which the recognition of an arbitrage “opportunity” made financial markets more efficient. It wasn’t a chance to make a profit that got noticed, it was the way the principles of arbitrage could be applied to the problem of correctly pricing options. Once financial economists figured it out, the solution enhanced the efficiency of financial markets because it made options useful as hedging instruments. Such instruments can be used to manage cash holdings only if they are correctly priced.

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In Search of the Option
Pricing Formula

Options are phenomenally popular these

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