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What are commodities?

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What are commodities?

Commodities are raw materials and agricultural products that are interchangeable with other identical units. A barrel of crude oil is a barrel of crude oil—the buyer doesn't care which field it came from, as long as it meets the chemical specifications. This fungibility, combined with global standardization, makes commodities the most liquid assets on Earth. Unlike stocks (which represent ownership of a specific company) or bonds (which are promises to repay specific borrowers), commodities are pure price discovery mechanisms: they move almost entirely on supply, demand, and expectations about future availability.

This book treats commodities as a distinct asset class—separate from stocks, bonds, and real estate. That distinction matters because commodities behave differently across market cycles. When inflation rises, stocks often suffer but commodities rally. When interest rates spike, bonds fall and commodity futures decline (because holding inventory becomes expensive). Understanding these dynamics is essential for portfolio construction and risk management.

Commodities fall into broad families: energy (crude oil, natural gas), precious metals (gold, silver, platinum), base metals (copper, aluminum, nickel), and agriculture (grains, softs, livestock). Each has unique supply constraints, seasonal patterns, and geopolitical exposure. A copper mine takes a decade to build; an oil well can be drilled in months. Corn is harvested once per year; crude oil flows 24/7. These physical realities shape how each commodity behaves in futures markets.

The key insight is this: commodities are priced at the margin. If global oil demand exceeds supply by just one percent, prices can double. If supply exceeds demand by one percent, prices can halve. This volatility stems from the inelasticity of both supply (you cannot drill a new oilfield overnight) and demand (people and factories need energy regardless of price, up to a point). It's this marginal mismatch that creates the massive price swings that define commodity investing.

Storage transforms commodity markets. Crude oil can be stored in tanks; gold in vaults; natural gas in underground reservoirs. Storage creates a bridge between present supply and future supply. If you expect crude to be more valuable next year, you can buy it today, store it, and sell it forward—capturing storage cost spreads. Conversely, if storage is full and production relentless, prices plummet. The entire structure of commodity futures (contango vs. backwardation) is determined by storage availability and cost.

This chapter establishes the foundations: what commodities are, how they're classified, why the commodity asset class is structurally different from stocks and bonds, and how storage and supply constraints create the market dynamics that drive everything else in this book. Master these concepts and the rest falls into place.

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