Commodities: what they are, what categories exist and what are their impact

June 2025 by André Themudo

In economics, a commodity is a tangible good that can be bought, sold, or exchanged for another of similar value. Commodities are the foundation of the global economy, providing essential raw materials for key sectors such as industry, agriculture, energy, and food. As a pillar of the world economy, the absence of the commodities market would severely disrupt entire industries. Their price fluctuations impact production costs, inflation, supply chains, and both political and business decisions.

In financial terms, commodities also function as investment instruments. Understanding them is essential for effective diversification and risk management strategies. They also have an impact on exchange rates, final pricing, and macroeconomic decision-making.

What is a commodity?

A commodity is a good produced by multiple manufacturers that maintains a sufficiently uniform level of quality, making products from different companies largely indistinguishable from one another. This standardization, known as fungibility, allows it to be easily traded in organized markets, such as commodity exchanges, simplifying global trade.

Raw materials such as coal, gold, and zinc are examples of commodities produced according to uniform industrial standards, which facilitates their commercialization. However, not all raw materials are considered commodities. Natural gas, for example, due to its high global transportation costs, makes it difficult to set a single price. Diamonds are another case: they vary too much in quality and do not exist in sufficiently uniform volumes to be classified as commodities.

The changing nature of commodities shows that not everything that is considered a commodity today has always had that status. The concept is associated with economic, technological, social, and political factors, which are constantly changing.

When the trade of a particular good causes excessive price instability, or when systemic risks arise due to speculation, regulators or commodity exchanges may intervene and, in some cases, prohibit its trading.

On the other hand, technological advancement and industrialization can transform previously unique or handcrafted goods into standardized products, suitable for commercialization as commodities. Their status always depends on the historical context and market developments.

Categories

In a global context, commodities are divided into three broad categories, each with its own characteristics and distinct impacts on financial markets:

• Energy commodities: these include oil, natural gas, and coal. Their prices are volatile, influenced by geopolitical factors, industrial demand, and technological innovations. 
• Agricultural commodities: these include cereals (wheat, corn, soybeans), coffee, sugar, cotton, and livestock. They are subject to seasonal and climatic variations, agricultural policies, and global demand. Given their direct link to food, they influence inflation and the cost of living worldwide.
• Metal commodities: these are broken down by precious metals (gold, silver, platinum) and industrial metals (such as iron, copper and aluminum), crucial for construction, industry, and technology.

Markets and trading

Commodities are essential assets in financial markets and are traded through various mechanisms:

• Futures markets: contracts that fix the future delivery price, reducing the risk of fluctuation.
• Spot markets: Transactions with immediate delivery and payment.
• ETFs and investment funds: these allow exposure to commodities without trading futures contracts.
• Digital platforms: the evolution of online platforms has facilitated access for private investors.

Impact 

With a vital role in economic stability and investment strategies, commodities are considered essential assets for hedging against inflation. They offer diversification and serve as an alternative to stocks and bonds, helping to reduce overall portfolio risk.

Fluctuating commodity prices create both risks and opportunities - while some investors seek to take advantage of these fluctuations, it is essential to carefully manage the potential for loss. These prices are particularly sensitive to the dynamics between supply and demand., reacting to global events such as conflicts, extreme weather events, or decisions by major institutional players, with long-term effects on financial markets.