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 and inappropriate for most 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. Position sizing should assume that any cryptocurrency holding can go to zero and you would still be fine.
A reasonable stance:
- If you don’t understand what it is or why it’s supposed to work, don’t buy it
- If you do buy, treat it as speculation, not investment: no more than 1-5% of net worth, with money you could lose entirely without it changing your financial plan
- Do not borrow to buy it, do not concentrate in it, and do not let recent price moves determine your allocation
- Keep it in a reputable exchange or self-custodied wallet with proper security practices; exchange failures and hacks have wiped out holdings before
Cryptocurrency may or may not be a meaningful part of diversified portfolios a decade from now. Today, the prudent default for most investors is a small allocation or none at all.
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. Allocation should be set in advance, then held
- 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 you can do
- Decide on a satellite cap before adding any. A common range is 0-15% of total portfolio across all satellites combined. Pick a number you can live with and stick to it
- Hold commodities, if at all, through low-cost diversified ETFs. Avoid single-commodity bets unless you genuinely understand the supply-demand picture
- Treat cryptocurrency as speculation in your accounting. Money you could lose entirely without it affecting your plan. Keep it small, keep it custody-safe, keep it boring
- Don’t add satellites until the core is in place. Emergency fund, high-interest debt, broad index fund exposure across stocks and bonds. Satellites without that foundation is the wrong order of operations
- Rebalance them like the rest of the portfolio. If a satellite balloons from 5% to 15%, trim it back. If it shrinks, top it up, but only if you still believe the original case
- Don’t confuse satellite with side-hustle. Some people buy crypto to learn, to participate, to be part of a community. That’s fine. 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.