What Is a Commodity and Understanding Its Role in the Stock Market


Investopedia / Joules Garcia

What Is a Commodity?

A commodity is a basic good used in commerce that is interchangeable with other goods of the same type. Commodities are most often used as inputs in the production of other goods or services. A commodity thus usually refers to a raw material used to manufacture finished goods. A product, on the other hand, is the finished good sold to consumers.

The quality of a given commodity may differ slightly, but it is essentially uniform across producers. When they are traded on an exchange, commodities must also meet specified minimum standards, also known as a basis grade.

Key Takeaways

  • A commodity is a basic good used in commerce that is interchangeable with other commodities of the same type.
  • Commodities are most often used as inputs in the production of other goods or services.
  • Investors and traders can buy and sell commodities directly in the spot (cash) market or via derivatives such as futures and options.
  • Hard commodities refer to energy and metals products while soft commodities are often agricultural goods.
  • Owning commodities in a broader portfolio is encouraged as a hedge against inflation.

What's a Commodity?

Understanding Commodities

Commodities are the raw inputs used in the production of goods. They may also be basic staples such as certain agricultural products. The important feature of a commodity is that there is very little, if any, differentiation in that good whether it is coming from one producer and the same commodity from another. A barrel of oil is basically the same product, regardless of the producer. The same goes with a bushel of wheat or a ton of ore. By contrast, the quality and features of a given consumer product will often be quite different depending on the producer (e.g., Coke vs. Pepsi).

Some traditional examples of commodities include grains, gold, beef, oil, and natural gas. More recently, the definition has expanded to include financial products, such as foreign currencies and indexes. Technological advances have also led to new types of commodities being exchanged in the marketplace. For example, cell phone minutes and bandwidth.

Commodities can be bought and sold on specialized exchanges as financial assets. There are also well-developed derivatives markets whereby you can buy contracts on such commodities (e.g., forwards, futures, and options). Some experts believe that investors should hold at least some portion of a well-diversified portfolio in commodities since they are not highly-correlated with other financial assets and may serve as an inflation hedge

Experts recommend around 5-10% of a portfolio be allocated to a mix of commodities. Those with a lower risk tolerance may consider a smaller allocation. Ordinary investors can look to one of several commodities ETFs or mutual funds to gain exposure.

Buyers and Producers of Commodities

The sale and purchase of commodities are usually carried out through futures contracts on exchanges that standardize the quantity and minimum quality of the commodity being traded. For example, the Chicago Board of Trade (CBOT) stipulates that one wheat contract is for 5,000 bushels and states what grades of wheat can be used to satisfy the contract.

Two types of traders trade commodity futures. The first are buyers and producers of commodities that use commodity futures contracts for the hedging purposes for which they were originally intended. These traders make or take delivery of the actual commodity when the futures contract expires.

For example, the wheat farmer who plants a crop can hedge against the risk of losing money if the price of wheat falls before the crop is harvested. The farmer can sell wheat futures contracts when the crop is planted and guarantee a predetermined price for the wheat at the time it is harvested.

Commodities Speculators

The second type of commodities trader is the speculator. These are traders who trade in the commodities markets for the sole purpose of profiting from the volatile price movements. These traders never intend to make or take delivery of the actual commodity when the futures contract expires.

Many of the futures markets are very liquid and have a high degree of daily range and volatility, making them very tempting markets for intraday traders. Many of the index futures are used by brokerages and portfolio managers to offset risk. Also, since commodities do not typically trade in tandem with equity and bond markets, some commodities can be used effectively to diversify an investment portfolio.

Special Considerations

Commodity prices typically rise when inflation accelerates, which is why investors often flock to them for their protection during times of increased inflation—particularly unexpected inflation. As the demand for goods and services increases, the price of goods and services rises, and commodities are what's used to produce those goods and services. 

Because commodities prices often rise with inflation, this asset class can often serve as a hedge against the decreased buying power of the currency.

Those interested in learning more about commodities and other financial topics may want to consider enrolling in one of the best investing courses currently available.

Examples of Commodities

Commodities are basic goods and materials that are widely used and are not meaningfully differentiated from one another. Examples of commodities include barrels of oils, bushels of wheat, or megawatt-hours of electricity. Commodities have long been an important part of commerce, but in recent decades the trading of commodities has become increasingly standardized.

What Is the Relationship Between Commodities and Derivatives?

The modern commodities market relies heavily on derivative securities, such as futures contracts and forward contracts. Buyers and sellers can transact with one another easily and in large volumes without needing to exchange the physical commodities themselves. Many buyers and sellers of commodity derivatives do so to speculate on the price movements of the underlying commodities for purposes such as risk hedging and inflation protection.

What Determines Commodity Prices?

Like all assets, commodity prices are ultimately determined by supply and demand. For example, a booming economy might lead to increased demand for oil and other energy commodities. Supply and demand for commodities can be impacted in many ways, such as economic shocks, natural disasters, and investor appetite (investors may purchase commodities as an inflation hedge if they expect inflation to rise).

What Is the Difference Between a Commodity and a Security or Asset?

Commodities are physical products that are meant to be consumed or used in the production process. Assets, on the other hand, are goods that are not consumed through their use. For instance, money or a piece of machinery are used for productive purposes, but persist as they are used. A security is a financial instrument that is not a physical product. It is a legal representation (e.g., a contract or claim) that represents certain cash flows generated from various activities (such as a stock representing the future cash flows of a business).

What Are the Types of Commodities?

Hard commodities are usually classified as those that are mined or extracted from the earth. These can include metals, ore, and petroleum (energy) products. Soft commodities instead refer to those that are grown, such as agricultural products. These include wheat, cotton, coffee, sugar, and soybeans, among others.

Where Are Commodities Traded?

The major U.S. commodity exchanges are ICE Futures U.S. and the CME Group, which operate four major exchanges: the Chicago Board of Trade (CBOT), the Chicago Mercantile Exchange (CME), the New York Mercantile Exchange (NYMEX), and the Commodity Exchange, Inc. (COMEX). There are also major commodities exchanges located around the world.

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  1. CME Group. "Grain and Oilseed Futures and Options," Page 3.

  2. Vanguard. "The Potency of Commodities as an Inflation Hedge."