Option (finance)

In the world of finance, an option is a specific type of contract. It is part of a larger group of tools called derivatives. A derivative is a financial instrument that gets its value from something else, known as an underlying asset.

This underlying asset could be a stock, a commodity, or even an interest rate. An option gives the holder the right to buy or sell this asset. Crucially, the holder is not obligated to do so. They can choose to use the right or let it expire. This choice is why options are so important for managing financial risk.

To understand how an option works, you must look at its specific terms. Every contract has a strike price, which is the set price for the transaction. It also has an expiration date, which is the final day the right can be used.

To get this right, the holder pays a fee called a premium. The person who creates the option is called the issuer or writer. If the holder decides to use their right, it is called exercising the option. If the expiration date passes without use, the option expires. In that case, the holder loses the premium, and the issuer keeps it as income.

There are two primary types of options: calls and puts. A call option gives the holder the right to buy an asset at the strike price. Investors typically buy call options when they expect the market price to rise above the strike price.

A put option gives the holder the right to sell an asset at the strike price. These are often used when someone expects the market price to fall below that price.

The holder's total cost when exercising a call is the strike price plus the premium paid. For a put, the holder sells the asset at the strike price after accounting for the premium.

Options can be traded in two different ways: on exchanges or over-the-counter. Exchange-traded options are standardized contracts. This means they follow set rules and terms that are the same for everyone.

These are settled through a clearing house, which guarantees the contract will be fulfilled. This system provides anonymity and keeps the markets orderly. In contrast, over-the-counter (OTC) options are private deals between two parties. These contracts are bilateral, meaning they are customized to meet specific needs. They do not require public advertising and face fewer regulatory requirements.

History shows that humans have used the logic of options for a very long time. The Greek philosopher Thales of Miletus is often called the first reputed option buyer. He predicted a large olive harvest and paid for the right to use olive presses in the spring. When the harvest was huge, he exercised his right and rented the presses for a profit. Later, in 1688, a book described the trading of "opsies" on the Amsterdam stock exchange. By the 1690s, puts and calls became well-known in London during the reign of William and Mary. In 1973, the Chicago Board Options Exchange was established, creating a modern system for standardized trading.

Options are used in many industries beyond just the stock market. In real estate, developers use call options to secure adjacent plots of land for large projects. They pay for the right to buy the land but are not forced to do so. In the film industry, producers buy options to gain the right to turn a book into a movie.

Even in banking, many bonds include "embedded options." These might allow a bond to be converted into common stock. Mortgage borrowers also have an option to repay their loans early, which is a type of callable option.

Understanding options requires looking at the many factors that change their value. The price of an option depends on the underlying asset's price and its volatility. Volatility refers to how much the price of the asset swings up and down.

Other factors include the time remaining until expiration and the risk-free rate of interest. Because these values change constantly, options are a highly active part of global finance. They allow people to speculate on price changes or protect themselves from unexpected market moves.