The previous post covered the four core asset classes most diversified portfolios are built from: stocks, bonds, real estate, and cash. Two other asset types come up in almost every investing conversation but don’t fit cleanly into that framework: commodities and cryptocurrency. They behave differently, generate returns differently, and play a different role in a plan.
The honest treatment is to give them a separate post rather than dilute the core four with sections that have a fundamentally different shape. By the end of this one, you’ll know what each is, what it’s for, and where the line sits between a sensible satellite allocation and a speculative bet.
Commodities: raw materials and inflation hedges
Commodities are physical goods traded in bulk: gold, silver, oil, natural gas, agricultural products (wheat, corn, coffee), industrial metals (copper, aluminium). They’re a distinct asset group because they behave differently from stocks, bonds, real estate, or cash.
How they generate returns: They don’t, in the traditional sense. A commodity has no cash flow. Gold doesn’t pay dividends. A barrel of oil doesn’t pay interest. The only way to make money is to sell it for more than you paid. Commodities are a bet on price, not on an underlying cash-producing business.
Typical characteristics:
| Dimension | Commodities |
|---|---|
| Return source | Price appreciation only (no cash flow) |
| Historical real return | Near 0% over very long periods for most; gold ~1% real long-term |
| Volatility | High and unpredictable; driven by geopolitics, weather, supply shocks |
| Liquidity | High for major commodities via futures and ETFs; lower for physical holdings |
| Best for | Inflation hedging and crisis protection as a small portfolio satellite |
Why people hold them:
- Inflation hedge: Commodity prices tend to rise during inflationary periods, partially offsetting the loss of purchasing power in cash and bonds
- Crisis hedge: Gold specifically has historically held value during major market dislocations and currency crises
- Diversification: Commodities are weakly correlated with stocks and bonds, so adding a small allocation can reduce overall portfolio volatility
How to hold them: Most investors use commodity ETFs (funds that track commodity prices or commodity producers) rather than physical storage. Gold is the exception; some investors hold physical gold or allocated gold accounts for crisis scenarios. Futures contracts exist but are complex, with roll costs that catch out many retail investors.
The honest limits: Over long periods, commodities have underperformed stocks and real estate in real terms. They’re a hedge, not an engine. A 5-10% allocation is a common ceiling in diversified portfolios; some investors hold none and are fine.
Cryptocurrency: a deliberate aside
Cryptocurrency (Bitcoin, Ethereum, and thousands of smaller tokens) doesn’t fit cleanly into traditional asset class frameworks. The fair treatment is to be explicit about that rather than pretend otherwise.
What it is not: A stock represents ownership of a business that generates cash flow. A bond represents a loan that pays interest. Real estate produces rent. Commodities at least have industrial or physical utility. Cryptocurrency has none of these. Its price is determined entirely by what the next buyer is willing to pay. That makes it closer to a collectible or a speculative asset than to a traditional investment.
What the honest case looks like: Some argue that Bitcoin specifically has properties of “digital gold”: a fixed supply, independence from any single government, and a growing network of holders. That case is coherent but unproven; Bitcoin has existed since 2009, which is a short track record by investment standards. Other cryptocurrencies have weaker cases and substantially higher failure rates.
What the volatility looks like: Bitcoin has had multiple drawdowns of 70-85% in its history, each time recovering to new highs over several years. That pattern may continue; it may not. That is why sizing usually assumes any cryptocurrency holding could go to zero.
How cautious investors tend to approach it:
- Many hold none, especially if they can’t explain what it is or why it’s supposed to work
- Those who do hold it usually treat it as speculation, not investment, commonly capping it at 1-5% of net worth, with money they could lose entirely without it changing their plan
- The biggest losses have come from borrowing to buy, concentrating, and letting recent price moves set the size
- Custody is its own risk: exchange failures and hacks have wiped out holdings before, and self-custody brings key-management risk
Cryptocurrency may or may not be a meaningful part of diversified portfolios a decade from now. Today, mainstream guidance treats a small allocation or none at all as the cautious range.
How satellites differ from the core
The core four asset classes share a structural property: each generates returns from an underlying economic activity. Stocks earn from company profits. Bonds earn from interest payments on loans. Real estate earns from rent and from the underlying need for shelter. Even cash earns small interest from short-term lending to banks or governments.
Satellites don’t have that. Their returns come purely from price movement, which means they depend on a future buyer paying more than the current owner did.
| Dimension | Core asset classes (stocks, bonds, real estate, cash) | Satellites (commodities, crypto) |
|---|---|---|
| Source of return | Underlying cash flow + appreciation | Price change only |
| Long-run real return | Positive on average, by structure | Near zero or unproven |
| Role in a portfolio | Wealth-building engine | Hedge or speculation |
| Reasonable allocation | Most of the portfolio | Small, optional satellite |
This isn’t a moral judgement. It’s a structural one. A portfolio without stocks, bonds, real estate, and cash is incomplete; a portfolio without commodities or cryptocurrency is fine. Treating satellites as if they were core assets is the most common mistake in this space.
Common mistakes
- Treating gold as an investment rather than a hedge. Gold’s job is to hold value during inflation and crises, not to compound wealth. Comparing gold’s return to stocks misses the point of holding it
- Confusing high volatility with high expected return. Cryptocurrency moves a lot. That doesn’t make it a high-return asset by any traditional measure; it makes it a high-uncertainty one
- Borrowing to buy speculative assets. Leverage on a volatile, non-cash-flow asset is one of the fastest ways to permanent loss
- Letting recent price action drive allocation. “Bitcoin is up 200% this year, I should buy more” is the classic late-cycle mistake. Setting the allocation in advance is the usual defence
- Holding commodities through individual futures contracts. Futures involve roll costs, contango, and complexity that wipes out most retail investors. ETFs that handle this internally are usually fine; futures trading directly is rarely worth it
- Ignoring custody risk for crypto. Coins held on a failed exchange are often unrecoverable. Self-custody adds key-management risk. Both are real and need a deliberate answer before scaling up
What this means in practice
- Caps are usually set in advance. A commonly cited range is 0-15% of the total portfolio across all satellites combined. Deciding the number before buying keeps price swings from deciding it for you
- Commodity exposure is usually held through diversified ETFs. Single-commodity bets depend on understanding one supply-demand picture well, which few people do
- Crypto is usually accounted for as speculation. That means money that could be lost entirely without affecting the plan, sized small, with custody thought through
- Satellites typically come after the core. An emergency fund, high-interest debt handled, and broad exposure across stocks and bonds usually come first; satellites without that foundation leave a plan fragile
- Satellites drift like anything else. If one balloons from 5% to 15%, rebalancing brings it back; topping up a shrinking one only makes sense if the original case still holds
- Satellite and side interest are different things. Some people buy crypto to learn, to participate, to be part of a community. That’s a legitimate choice, but it is not the same as a financial plan
The four core asset classes plus a small, deliberate satellite allocation is the shape most diversified portfolios actually take. Commodities and cryptocurrency are real categories with legitimate (and limited) roles. The mistake is letting marketing or social-feed energy promote them from satellite to core.
You now know what the building blocks of investing are and where the satellites sit around them. Knowing the categories is one thing; spreading your money across them so no single bet can sink you is another. That’s the principle behind diversification, and it’s where we head next.