Commodities — What They Are and How to Invest
Commodities are raw materials like gold, oil, and wheat traded on global markets. Learn how commodity investing works, the role of futures, and how to add commodities to your portfolio.
Definition
Commodities are standardized, interchangeable raw materials or primary products that are traded on organized exchanges. They include physical goods like crude oil, gold, natural gas, wheat, copper, and coffee. Unlike stocks or bonds, commodities are tangible — they exist in the physical world and have intrinsic utility.
Commodity markets are among the oldest in finance, dating back to rice futures trading in 17th-century Japan. Today, global commodity markets trade over $20 trillion annually, with major exchanges including the CME Group (Chicago), ICE (London), and LME (London Metal Exchange).
How It Works
Categories of commodities
| Category | Examples | Key Exchanges |
|---|---|---|
| Energy | Crude oil (WTI, Brent), natural gas, gasoline | NYMEX, ICE |
| Precious metals | Gold, silver, platinum, palladium | COMEX, LBMA |
| Industrial metals | Copper, aluminum, zinc, nickel | LME |
| Agriculture | Wheat, corn, soybeans, coffee, cocoa | CBOT, ICE |
| Livestock | Live cattle, lean hogs | CME |
| Soft commodities | Cotton, sugar, orange juice | ICE |
How commodity prices are determined
Unlike stocks (valued by future earnings), commodity prices are driven by:
- Supply: Weather, mining output, OPEC decisions, geopolitical disruptions
- Demand: Global GDP growth, China industrial activity, seasonal patterns
- Storage costs: Physical commodities cost money to store (contango)
- Currency: Commodities are priced in USD — a weaker dollar makes commodities cheaper for non-US buyers
Ways to invest in commodities
| Method | Pros | Cons | Example |
|---|---|---|---|
| Physical | Direct ownership, no counterparty risk | Storage, insurance, illiquid | Gold coins, bullion |
| Futures contracts | Leverage, liquid, precise exposure | Roll costs, complexity, margin calls | WTI crude futures |
| Commodity ETFs | Simple, liquid, diversified | Tracking error, contango | iShares Physical Gold (IGLN) |
| Mining/producer stocks | Dividend potential, operational leverage | Company-specific risk, not pure exposure | Barrick Gold, BHP |
| Commodity index funds | Broad diversification | Roll yield drag, underperformance | Bloomberg Commodity Index ETF |
Contango and backwardation
Futures-based commodity ETFs face a structural issue:
- Contango: Future prices > spot price (normal for storable commodities). Rolling from expiring to new contracts costs money → negative roll yield → ETF underperforms spot price over time.
- Backwardation: Future prices < spot price. Rolling generates positive roll yield → ETF outperforms spot price.
Oil ETFs in contango have historically lost 5-10% annually to roll costs, even when oil prices were flat.
Example
Portfolio diversification with commodities:
European investor Maria has a EUR 200,000 portfolio (80% stocks, 20% bonds). She considers adding 10% in commodities.
Option 1 — Physical gold ETC:
- iShares Physical Gold ETC (IGLN): Backed by gold bars in London vaults
- TER: 0.12%
- No contango issue (physical, not futures)
- Investment: EUR 20,000 (10% of portfolio)
Option 2 — Broad commodity ETF:
- L&G All Commodities UCITS ETF: Tracks Bloomberg Commodity Index
- 25% energy, 25% agriculture, 20% industrial metals, 15% precious metals, 15% livestock
- TER: 0.15%, but contango drag ~2-5% annually
- Investment: EUR 20,000
Historical performance (2000-2024):
| Asset | Annualized Return | Worst Year | Correlation with stocks |
|---|---|---|---|
| Global equities (MSCI World) | 7.5% | -40% (2008) | 1.00 |
| Gold | 8.2% | -28% (2013) | -0.05 |
| Broad commodities | 2.1% | -33% (2008) | 0.40 |
| Bonds (Global Agg) | 3.5% | -16% (2022) | -0.20 |
Gold has been the standout commodity — outperforming bonds with near-zero correlation to equities. Broad commodity indices have struggled due to contango and energy price volatility.
2022 — commodities shine during inflation: When stocks fell -18% and bonds fell -16%, commodities rose +16% (energy +40%, wheat +20%). This is exactly the diversification benefit — commodities protect against inflation, which destroys both stock and bond values.
Why It Matters
Inflation hedge
Commodities are real assets — their prices tend to rise with inflation. When central banks print money, the price of a barrel of oil or an ounce of gold adjusts upward. Stocks and bonds struggle during inflationary periods, making commodities a natural portfolio hedge.
Geopolitical barometer
Commodity prices instantly reflect geopolitical events:
- Russia-Ukraine conflict (2022): European natural gas +300%, wheat +50%
- OPEC production cuts: Oil price spikes within hours
- Chinese lockdowns (2020-2022): Copper and iron ore volatility
Portfolio diversification
Adding 5-10% commodities (especially gold) to a stock/bond portfolio has historically improved risk-adjusted returns (higher Sharpe ratio) due to low correlation with traditional assets.
Real economy indicator
Copper is called "Dr. Copper" because its price correlates with global economic health. Rising copper demand signals industrial growth; falling demand signals slowdown. The Baltic Dry Index (shipping rates for bulk commodities) is another leading indicator.
Risks and Pitfalls
No yield — commodities don't pay income
Unlike stocks (dividends) or bonds (interest), commodities generate no income. You are purely betting on price appreciation. This means commodities must outperform inflation just to break even in real terms.
Contango destroys long-term returns
Broad commodity ETFs based on futures have massively underperformed spot prices over the last 15 years. The Bloomberg Commodity Index is still below its 2008 peak in nominal terms. Physical gold or gold mining stocks avoid this problem.
Extreme volatility
Oil dropped from $60 to -$37 per barrel in April 2020 (yes, negative — storage was so scarce that sellers paid buyers to take delivery). Natural gas can swing 30% in a single week. This volatility is not for the faint-hearted.
Currency risk for European investors
Commodities are priced in USD. A European investor buying a gold ETF priced in EUR benefits when the dollar strengthens and loses when it weakens — adding an extra layer of volatility unrelated to the commodity itself.
ESG and regulatory pressure
Fossil fuel commodities face long-term demand destruction from energy transition. Coal has already peaked globally. Oil demand may peak by 2030. Investing in energy commodities is a bet against the green transition timeline.
FAQ
What is the best commodity for a long-term portfolio?
Gold has the strongest track record as a portfolio diversifier — near-zero correlation with equities, proven inflation protection, and no contango issue when held physically. Allocating 5-10% of your portfolio to physical gold or a physically-backed gold ETC is a widely recommended strategy.
Should I buy gold coins or a gold ETF?
For amounts under EUR 10,000, physical coins (Austrian Philharmonic, South African Krugerrand) are viable — no counterparty risk, tax advantages in some jurisdictions (gold coins are VAT-exempt in the EU). For larger amounts, a gold ETC is more practical — lower spreads, easier to sell, safely stored by a custodian.
Are commodity ETFs available on IKE/IKZE (Polish tax-advantaged accounts)?
Yes — UCITS-compliant commodity ETFs listed on European exchanges (Xetra, Euronext) can be held in Polish IKE/IKZE accounts, eliminating the 19% capital gains tax.
How do commodity prices affect the Polish economy?
Poland is a net importer of oil and gas, so rising energy prices increase inflation and trade deficits. However, Poland is a significant copper producer (KGHM) and agricultural exporter — rising copper and grain prices benefit these sectors.
Related Articles
- Risk Parity — portfolio strategy that often includes commodities
- Yield — why commodities lag income-producing assets
- See the full financial dictionary for more terms
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