Commodity
A commodity is a basic good used in commerce that is interchangeable with other goods of the same type, and that is typically produced, sold, and traded in large quantities. Commodities serve as inputs in the production of other goods or as essential consumption items, and they are the underlying assets of major markets for futures, options, and other derivatives.
Definition
A commodity is a good that is homogeneous and fungible—that is, units of the commodity are interchangeable, and the market does not distinguish between units produced by different suppliers. This homogeneity allows commodities to be traded on exchanges, where standardised contracts are used and prices are determined by supply and demand.
The defining characteristics of commodities include: homogeneity, meaning units are identical; fungibility, meaning one unit can substitute for another; standardisation, meaning quality grades are established; and large-scale production and trade, meaning volumes are sufficient to support active markets.
Categories of commodities
Commodities are commonly classified into several categories.
Agricultural commodities include grains (wheat, corn, rice), oilseeds (soybeans), soft commodities (coffee, cocoa, sugar, cotton), and livestock (cattle, hogs).
Energy commodities include crude oil, natural gas, coal, and refined products such as gasoline and heating oil.
Metals are divided into base metals (copper, aluminium, zinc, nickel, lead, tin) used in industrial production, and precious metals (gold, silver, platinum, palladium) used in jewellery, investment, and industry.
Livestock and meat commodities include cattle, hogs, and their products.
Other commodities include chemicals, rubber, and various raw materials.
Commodity markets
Commodity markets are the institutions through which commodities are bought and sold. They include spot markets, where commodities are traded for immediate delivery, and futures markets, where contracts specify delivery at a future date.
Major commodity exchanges include the Chicago Mercantile Exchange (CME), the Intercontinental Exchange (ICE), the New York Mercantile Exchange (NYMEX), the London Metal Exchange (LME), and the Shanghai Futures Exchange. These exchanges provide standardised contracts, clearing and settlement services, and price transparency.
Price determination
Commodity prices are determined by the interaction of supply and demand, but they are subject to distinctive influences.
Supply factors include weather (for agricultural commodities), production levels, inventory stocks, geopolitical events, and the discovery or depletion of resources.
Demand factors include economic growth, industrial production, consumption patterns, and the growth of emerging economies.
Speculation plays a significant role in commodity markets, particularly in futures markets, where traders take positions based on expectations of future prices. The extent to which speculation stabilises or destabilises prices is debated.
Exchange rates affect commodity prices because most commodities are priced in a single currency (typically the United States dollar), so that movements in that currency affect the affordability of commodities in other countries.
Macroeconomic conditions, including interest rates and inflation, influence the demand for commodities as investments.
Commodity prices and the economy
Commodity prices have significant macroeconomic effects. Rising commodity prices, particularly oil, raise costs for firms and reduce the purchasing power of consumers, contributing to cost-push inflation. They also redistribute income from commodity-importing to commodity-exporting countries.
Sharp movements in commodity prices have been associated with major economic episodes. The oil price shocks of the 1970s contributed to stagflation in industrialised economies. The commodity price boom of the 2000s, driven by rapid growth in emerging economies, raised concerns about inflation and resource scarcity.
Commodity prices are also watched as an indicator of global economic conditions, since demand for commodities is closely tied to industrial activity.
Commodities as an asset class
Commodities have become an increasingly important asset class for investors, offering diversification benefits because their prices tend to have low correlation with equity and bond returns. Investors gain exposure to commodities through futures contracts, commodity exchange-traded funds (ETFs), commodity index funds, and direct ownership.
Because commodities generate no income (unlike bonds, which pay interest, or equities, which pay dividends), the return on commodity investment comes primarily from price changes. This distinguishes commodities from financial assets and means that their valuation depends on expected future supply and demand conditions rather than on current income.