What Is Commodity Investing — Energy, Metals, Agriculture

Commodities are physical assets that serve as the 'raw materials' of our lives and industry. They divide broadly into three branches.

Energy: Fuels that move the world, like crude oil (WTI, Brent) and natural gas.

Metals: Precious metals like gold, silver, and platinum, and industrial metals like copper, aluminum, and nickel.

Agriculture: Things we eat and drink, like wheat, corn, soybeans, coffee, and sugar.

Unlike stocks (a stake in a company) or bonds (money lent out), commodities do not generate dividends or interest by themselves. They are assets whose returns are determined purely by 'whether the price rises.'

The first reason commodities draw attention is 'inflation hedging.' Prices rising often means the prices of commodities like crude oil, food, and metals are rising. So people believe commodities can rise alongside prices and protect purchasing power when inflation surges.

In fact, one analysis (1998–2025) rated commodities as the asset class among major ones that responds most sensitively to inflation (i.e., is efficient as a hedge).

The second reason is diversification. Commodities sometimes move on a different current from stocks and bonds, so mixing them into a portfolio is sometimes expected to have the effect of cushioning overall swings.

An individual cannot stack thousands of barrels of crude oil or tons of wheat directly in a warehouse. So commodity investing is mostly done through 'futures' or ETFs that hold them.

Here a trap called 'roll cost' arises. Futures have expirations, so as expiration approaches you must switch to the next month's contract (roll over). But in a situation where the farther-out contract is more expensive (contango), you sell the cheap current-month contract and buy the expensive next-month contract. As this loss piles up, your return keeps getting shaved even if the commodity price stays flat.

In an extreme case, in 2020 natural gas rose about +13% in spot price that year, yet the total-return index rolling futures actually recorded about -45%. It was an event that showed how frightening contango can be.

Commodities are attractive but have a distinct character.

First, volatility is high. They swing sharply even within a day due to individual factors like weather, war, inventories, and OPEC decisions.

Second, there is no cash flow. With no dividends or interest, there is no 'snowball' that grows on its own no matter how long you hold.

Third, a structural cost called roll cost can be attached.

So commodities are often described as a 'seasoning' for inflation protection and diversification, rather than a 'main dish.' Even if you hold them, it's important to understand those risks and costs and set your weighting accordingly.