Estimated study time: 45 minutes
Content:
Commodities are physical goods — energy (crude oil, natural gas), metals (gold, silver, copper), and agriculture (wheat, corn, soybeans, coffee) — that are traded in spot and futures markets. Unlike financial assets, commodities have no intrinsic cash flows (no dividends or coupons) — their return comes from price appreciation plus, for futures investors, the roll yield and collateral yield. Commodity investments have historically provided inflation protection (commodity prices tend to rise with inflation, particularly as energy and food costs are direct components of price indices), portfolio diversification (historically low correlation with stocks and bonds), and access to global supply-demand dynamics. However, commodities also exhibit high volatility, no income, storage costs, and potential for extended bear markets driven by supply expansion.
Investors access commodities primarily through: (1) commodity futures contracts, (2) physical ownership (primarily for precious metals via gold bullion or ETFs), (3) commodity-linked equities (energy producers, mining companies, agricultural firms), and (4) commodity index funds. Commodity futures are the most common institutional approach. The total return on a commodity futures investment has three components: (1) spot return (change in the spot price of the commodity), (2) roll yield (the return earned from rolling expiring futures contracts into new ones), and (3) collateral yield (the return on the Treasury bills or other instruments posted as margin). The roll yield can be positive or negative depending on the term structure of futures prices.
The term structure of commodity futures determines the roll yield. When near-term futures prices are higher than far-term prices, the market is in backwardation — rolling futures forward generates positive roll yield (buying cheap far-term contracts and selling expensive near-term contracts). Backwardation often occurs when there is a current supply shortage or high near-term demand. When near-term prices are lower than far-term prices, the market is in contango — rolling futures generates negative roll yield. Contango typically occurs when storage costs dominate and there is no scarcity premium (convenience yield is low). For commodity investors, the roll yield can be a major contributor or detractor: crude oil has historically spent significant time in contango, making passive futures-based oil investments significantly underperform spot oil price returns.
The convenience yield is the implicit benefit of holding the physical commodity versus holding futures. Holders of physical inventory benefit from the ability to use the commodity immediately when needed — a value not available to futures investors. The relationship between spot and futures prices reflects: Futures price = Spot price × e^((r + storage cost – convenience yield) × T). When convenience yield is high (tight supply, high current demand), futures prices are in backwardation. When convenience yield is low (ample supply, weak demand), the storage cost dominates and futures are in contango. Gold, as a monetary metal held primarily for investment purposes, has minimal convenience yield and nearly always trades in contango.
Key Terms:
Quiz Questions:
Q1. A commodity futures curve for natural gas shows that the 1-month futures price is $4.50/MMBtu and the 6-month futures price is $4.00/MMBtu. This market structure is called:
A) Contango, because near-term prices are lower than far-term prices B) Backwardation, because near-term prices exceed far-term prices C) Normal backwardation, because futures prices are below expected future spot prices D) Contango, because there is a cost of carry premium
Answer: B — When near-term futures prices ($4.50) exceed far-term prices ($4.00), the market is in backwardation. Natural gas is often in backwardation during winter months when near-term demand is high and supply is strained. Investors who hold long futures positions benefit from positive roll yield in backwardation: they sell expiring $4.50 contracts and buy new $4.00 contracts, profiting from the price differential as the new contract converges toward spot.
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Q2. An investor holds a long position in crude oil futures. The spot price of crude is $80/barrel, but crude oil is in contango with 3-month futures at $84/barrel. As the investor rolls the expiring contract (at $80) into the next 3-month contract (at $84), the roll yield is:
A) Positive, because the investor buys at $80 and will sell at $84 B) Negative, because the investor buys at $84 (more expensive) when the expiring contract was at $80 C) Zero, because the total commodity return depends only on spot price changes D) Positive, because the investor profits from the spread between $80 and $84
Answer: B — In contango, the investor is rolling from an expiring near-term contract (at $80) into a more expensive far-term contract (at $84). They sell the expiring contract at $80 and buy the new contract at $84 — paying $4 more for each barrel. As the new contract's price converges toward spot over time, it will fall from $84 to approximately $80 (absent spot price changes), generating a capital loss of $4/barrel. This negative roll yield is the "drag" that makes crude oil futures chronically underperform spot oil prices during periods of contango.
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Q3. Which of the following best explains why gold typically trades in contango rather than backwardation?
A) Gold production is highly seasonal, creating near-term supply scarcity B) Gold has very low convenience yield since it is held primarily as a store of value rather than consumed; storage costs and financing costs dominate C) Gold demand from jewelry manufacturers creates strong near-term spot demand D) Gold production is concentrated in unstable regions, creating risk premium for near-term delivery
Answer: B — Gold has minimal convenience yield because it is not consumed — holders do not need immediate physical availability to meet production needs the way an oil refiner or semiconductor manufacturer might. Since the benefit of holding physical gold is low, the futures curve reflects primarily the cost of carry (financing + storage costs), pushing futures prices above spot — contango. This is different from energy commodities, which are actively consumed and where supply tightness can generate strong backwardation.
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Q4. The total return on a commodity futures investment consists of three components. A commodity futures portfolio earns a 6% spot return, a –3% roll yield, and a 4% collateral yield. What is the total return?
A) 7% B) 6% C) 10% D) 3%
Answer: A — Total return = Spot return + Roll yield + Collateral yield = 6% + (–3%) + 4% = 7%. The negative roll yield (contango) partially offsets the spot price gain and collateral return. This calculation illustrates why commodity futures returns can significantly differ from spot price returns — investors are exposed to all three components, not just spot price movements. The roll yield has historically been the most volatile and economically significant component.
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Q5. A pension fund is considering adding a commodity futures allocation to its portfolio. The PRIMARY benefit the fund's investment committee should highlight is:
A) Commodities consistently outperform equities over long periods B) Commodity futures provide guaranteed income through roll yield C) Commodities have historically provided inflation hedging and diversification from stocks and bonds D) Commodity allocations eliminate currency risk in international portfolios
Answer: C — The primary case for commodity allocations in institutional portfolios is twofold: inflation protection (commodity prices, particularly energy, food, and metals, tend to rise with inflation) and diversification (historically low or negative correlation with stock and bond returns, especially during inflationary environments). Commodities do not "consistently outperform" equities (Option A) — they have long periods of underperformance. Roll yield is not guaranteed (Option B) — it can be substantially negative in contango markets.
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