Commodities & Inflation Hedge

Commodities are physical goods: oil, gold, wheat, copper. They hedge against inflation and political shocks, but they drag long-term returns because futures contracts suffer from negative roll yield and storage costs.

Key takeaways

• Commodities have delivered roughly 5% annualized returns since 1970, materially below stocks or bonds
• The inflation hedge works only in acute supply shocks; most inflation is driven by monetary policy, not commodity availability
• Commodity futures lose money through "negative roll yield" as investors roll forward contracts
• A 5% commodities allocation cost typical investors 0.3–0.5% in annualized return over 50 years
• The 2022 commodity surge was exceptional; it is not a reliable pattern for future inflation periods

What commodities actually are

Commodities are raw materials: crude oil, natural gas, copper, wheat, corn, gold, silver, soybeans. When investors talk about "adding commodities to a portfolio," they usually mean commodity futures contracts traded on exchanges like the CME, not physical warehouses of crude oil or grain.

A futures contract is a bet on the future price of a commodity. You do not own the commodity; you own a contract that says "I agree to buy [commodity] at [price] on [date]." When that date arrives, you either take delivery or roll the contract forward to a later date. Commodity mutual funds and ETFs do this rolling automatically. The fund buys a June oil contract, and when June arrives, it sells that contract and buys a July contract. It repeats this monthly forever.

This rolling is where commodities hurt investors. When you roll a contract forward, you are typically selling the current contract at a lower price and buying the future contract at a higher price. This difference is called "roll yield" or "roll cost." When roll yield is negative, you are paying for the privilege of staying in the commodity. Over decades, this drag compounds significantly.

Commodities also have storage costs. Someone has to warehouse the crude oil, maintain the grain silos, secure the gold. These costs are built into the futures curve. Investors in commodity funds ultimately bear these costs through the management fees and the embedded roll costs in the futures contracts themselves.

Return history and the drag effect

From 1970 through 2024, the S&P 500 returned roughly 12.5% annualized. The Bloomberg Commodity Index returned roughly 5% annualized. Over 50 years, that 7.5% difference compounds massively. A dollar invested in the S&P 500 in 1970 grew to roughly $550. A dollar in commodities grew to roughly $45. This is not a small difference.

What explains this? Commodities do not have earnings growth. Oil barrels do not compound. Gold does not pay dividends. A commodity's only return is price appreciation or, in some cases, a yield from lending the commodity (gold lease rates, for example). Meanwhile, stocks compound through earnings reinvestment and economic growth. Over a century, stocks double-earnings roughly every 12 years; commodities do not.

The negative roll yield amplifies this disadvantage. In a "normal" commodity market—when near-term futures cost more than distant futures (called contango)—rolling costs money. You sell September oil at $80 and buy October oil at $81. Repeat 12 times per year for 50 years, and the drag becomes severe. In commodity bear markets, when distant futures cost less than near-term futures (backwardation), you make money on rolls. But the typical market structure is contango, creating a structural return headwind.

This is not an argument against owning commodity-exposed equities. Stocks of oil companies, mining companies, and agricultural producers are embedded in the S&P 500. When oil prices rise, these stocks often rally. The difference is that equity investors also benefit from the companies' efficiency gains and dividend reinvestment, not just the underlying commodity price.

The inflation hedge narrative

The primary argument for commodities is inflation protection. Commodities are real assets. When inflation rises, the thinking goes, commodity prices rise, and your commodity allocation preserves purchasing power. Bonds suffer from inflation because their fixed coupon becomes less valuable. Stocks sometimes struggle because inflation raises discount rates. But commodities, as physical goods that people must buy, should hold value in an inflationary environment.

This narrative has some truth, but it is incomplete. Inflation has many causes. Supply-driven inflation (a hurricane disrupts oil production, or a chip shortage drives up semiconductor costs) does make commodity prices rise faster. Demand-driven inflation (everyone has cash and bids up prices) also raises commodity prices. But monetary-driven inflation (the Fed simply allows the money supply to balloon) does not necessarily raise real commodity prices, and by definition does not increase purchasing power for the commodity holder.

From 1970–1980, when inflation averaged 7.5% per year and peaked above 13%, commodities performed well. But from 1980–2020, when inflation averaged 2.5%, commodities were a drag. Inflation happened—it was real—but commodities did not hedge it effectively. The inflation was stable and expected, not a supply shock.

In 2022, when inflation spiked to 8–9% due to energy supply disruptions (Russia's invasion of Ukraine) and supply chain shocks, commodities surged. Oil hit $120 per barrel. Agricultural commodities spiked. An investor with a 5–10% commodities allocation outperformed. This felt like vindication: "See, commodities DO hedge inflation."

But 2022 was unusual. It was a supply-shock inflation, not a monetary inflation. And it reversed sharply. By 2024, oil had fallen back to $85–90 per barrel. Inflation had moderated. An investor who had added commodities in 2023, convinced they had finally found the inflation hedge, would have been disappointed by 2024.

Inflation protection through other means

A more reliable inflation hedge is a diversified bond portfolio that includes TIPS (Treasury Inflation-Protected Securities). TIPS are explicitly designed to adjust their principal for inflation. Their yield is "real yield"—return above inflation. If inflation rises, TIPS principal rises with it, giving you purchasing power protection. This is more direct and more reliable than betting on commodity prices.

Another approach is real estate. Both physical property and REIT ownership provide some inflation protection. Property rents tend to rise with inflation. Commercial real estate leases often include inflation escalation clauses. Again, this is more direct than commodities.

International equities also provide some diversification across inflationary environments. When US inflation spikes but global inflation is moderate, US stocks and commodities spike while international assets lag. Having both gives you less concentrated inflation exposure than commodities alone.

For most long-term investors, inflation protection is a second-order concern. The real driver of purchasing power is real return: how much your portfolio grows above inflation. A diversified portfolio of 70% stocks, 20% bonds, and 10% real estate, rebalanced regularly, will preserve purchasing power better over 30 years than the same portfolio with commodities swapped in.

Commodity allocation in practice

Those few investors who do allocate to commodities typically allocate 5–10% of their portfolio. A common approach is 60% stocks, 30% bonds, 5% commodities, 5% gold. Or 70% stocks, 20% bonds, 10% commodities.

The cost of this decision is calculable. Over 30 years, a 10% commodities allocation costs roughly 0.3–0.5% per year in foregone returns, compounded. A $1 million portfolio grows to $7.6 million without commodities (at 7% real returns) and $7.2 million with commodities (at 6.7% returns). The cost is $400,000 in real terms.

This cost is justified only if you have genuine conviction that commodity supply shocks will dominate your investing lifetime, or that inflation will be structurally higher than the past 40 years. If you are under 50, inflation has been stable and low for nearly your entire adult life. The odds that commodity allocations will pay off are not high.

Gold as a special case

Gold deserves separate treatment. Gold is a commodity, but it behaves differently from agricultural commodities or energy. Gold has no yield—it does not pay dividends or interest. Its only return is price appreciation. But gold has been held by humans for 5,000 years because it is a safe store of value and a medium of exchange. Central banks hold gold reserves. In financial crises, gold rallies because investors flee to safety.

From 1980–2000, gold was a terrible investment. From 2000–2012, gold surged as hedge funds and investors fled stocks after the tech crash and then stocks again after 2008. From 2012–2020, gold underperformed. From 2020–2024, gold rallied strongly as central banks expanded balance sheets.

Some allocators recommend 5–10% gold as a hedge against financial crises or currency debasement. A small allocation costs little. A $1 million portfolio with 5% gold ($50,000) might have avoided some panic selling in 2008 if gold had spiked to $2,000 while stocks crashed. But holding gold also requires accepting 10–15 year periods of underperformance.

If you want a crisis hedge, gold is less efficient than simply holding dry powder (cash or short-term bonds) to buy stocks during crashes. This requires discipline, but it works better historically.

The 2022 lesson

The 2022 spike in commodity and oil prices was exceptional. Russia's invasion of Ukraine disrupted oil and gas supplies to Europe. Energy prices spiked 50%+ in months. Investors who had dismissed commodities as a "return drag" suddenly wished they had owned them. Articles praising commodities flooded financial media.

But here is the danger of allowing recent events to drive allocation decisions. By 2024, oil had fallen back to prior levels. The Ukraine war continued, but energy markets had adjusted. An investor who had rushed into commodities in late 2022 or early 2023—convinced that supply shocks were the "new normal"—would have locked in losses or opportunity costs by 2024.

Exceptional events should not drive structural allocation decisions. A 50-year career is longer than any single commodity cycle. If you allocate to commodities to hedge supply shocks, commit to it for the full 50 years, knowing that most years will not have supply shocks and you will underperform. If you cannot accept that, do not add commodities.

Decision tree for commodity allocation

Related concepts

• ./02-why-allocation-dominates-returns.md
• ./03-stocks-vs-bonds-the-core-trade-off.md

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Next we'll explore inflation-protected bonds—TIPS and linkers—and when they make sense alongside traditional fixed income.