Common mistakes about commodities and gold

The common belief: Buying a commodity ETF gives you the spot return of the underlying, so if oil rises 20% the ETF rises roughly 20%.

What the data shows: Most commodity ETFs hold futures, not the physical good, and must roll expiring contracts forward. When the curve is in contango, each roll sells the cheaper near contract and buys a more expensive later one, creating a structural drag. In 2020 the United States Oil Fund posted an annual return of about -68% even as crude recovered from its April lows, showing how roll cost and curve shape can decouple an ETF from the spot price quoted in headlines.

→ Detailed explanation: What is contango and why does it erode commodity ETF returns?

The common belief: When a commodity is in backwardation, the market is signalling tight supply, so it is a bullish setup for the price.

What the data shows: Backwardation describes the term structure, not a spot-price forecast. In Gorton and Rouwenhorst's study of 1959-2004 (Financial Analysts Journal, 2006), fully collateralized commodity futures delivered equity-like returns, with much of that return coming from roll yield and collateral rather than spot appreciation. After the mid-2000s, persistent contango turned roll yields negative and average returns fell, a reminder that the curve, not the headline, drives the carry.

→ In-depth explanation: How does backwardation affect commodity investing?

The common belief: Gold protects purchasing power because it rises with inflation, so holding it leaves you hedged against rising prices.

What the data shows: Over short and medium horizons the link is weak. Gold peaked near $850 an ounce in January 1980, then fell to roughly $264 by 2000, a real loss of about 85% even though U.S. consumer prices roughly doubled across those two decades. Erb and Harvey's "Golden Constant" work (Financial Analysts Journal, 2020) characterizes gold as an expensive inflation hedge with a low prospective real return. Gold's strongest stretches, the 1970s, 2008-2011 and 2024-2026, coincided with negative or falling real interest rates and monetary stress, not simply with high CPI.

→ The full explanation: Why is gold a hedge against monetary instability not inflation?

The common belief: Silver behaves like gold but at a lower price point, so it is a discounted way to own the same exposure. Related material: silver and platinum beyond gold.

What the data shows: Silver is far more volatile, and roughly half of its demand is industrial, in solar, electronics and electric vehicles, so it responds to the manufacturing cycle as well as to monetary flows. The gold-to-silver ratio swings widely: it spiked to around 125:1 in the March 2020 panic as investors fled to gold and silver's industrial demand seized, then compressed sharply as silver recovered. That dual identity makes silver a higher-beta, less predictable asset than gold, not a discount copy.

→ Full breakdown: What drives silver's volatility compared to gold?

The common belief: Crude prices move on OPEC decisions and geopolitical headlines, with inventories a footnote.

What the data shows: Physical storage is often the proximate driver. On 20 April 2020 the front-month WTI contract settled at -$37.63 a barrel, the first negative settlement since the contract launched in 1983, because storage at the Cushing delivery hub was saturating and holders had nowhere to put the oil. Weekly EIA inventory builds and draws routinely move prices ahead of, and independently of, OPEC announcements.

→ Fuller explanation: How do oil inventories affect crude prices?

The common belief: Structural demand from electrification and scarcity means commodities only go up from here.

What the data shows: Supercycles are multi-decade and they end. The China-driven 2000s supercycle, during which the IMF commodity index rose roughly fourfold between January 2000 and mid-2008, peaked around 2011. The Bloomberg Commodity Index then fell about 46% from its 2011 high across a roughly decade-long downtrend, with some mining equities down 80-95%. The current energy-transition thesis may be real, but treating any supercycle as one-directional ignores how the previous one resolved.

→ Extended explanation: What is the commodities supercycle and where are we?

The common belief: Copper has a PhD in economics, so its price is a clean leading indicator of global growth and recessions.

What the data shows: Copper is sensitive to industrial activity, but its signal has grown noisier. China has accounted for roughly half of incremental global demand for major metals since the 2000s, so copper increasingly reflects Chinese property and infrastructure cycles, and more recently electrification demand, rather than broad global growth. Copper roughly quadrupled from the early 2000s to its 2011 peak on that China shock, a move about Chinese investment more than the world economy. A related perspective: the Chinese building signal in iron ore.

→ The complete explanation: What is the relationship between copper prices and economic growth?

The common belief: Record central-bank gold purchases are a sovereign inflation bet, hedging rising prices the way a retail buyer might.

What the data shows: The motive is reserve diversification, not an inflation call. Central banks bought more than 1,000 tonnes of gold in each of 2022, 2023 and 2024, led by 2022's roughly 1,082 tonnes, the most since 1950, against an average near 473 tonnes a year over 2010-2021. The acceleration followed the freezing of Russia's foreign reserves in 2022, which made gold's lack of counterparty risk strategically valuable to sanction-exposed sovereigns.

→ Full account: Why is gold reserve accumulation by central banks rising?