Anyone who has filled a grocery cart lately knows inflation is not an abstraction. It shows up at the till. What is less obvious is that the word “hedge” covers three very different pieces of machinery. TIPS are a contract with a government. Commodities are a claim on physical scarcity, wrapped in the plumbing of futures markets. Cash is a promise of nominal safety that quietly leaks purchasing power. Comparing them is not about picking a winner. It is about knowing which risk you are trying to hand off, and what you are willing to pay for the hand-off.
Three mechanisms, three promises
Start with what each instrument actually is.
TIPS are debt. You lend to the U.S. Treasury and it promises to adjust the principal along with the consumer price index. Commodities are goods — oil, copper, wheat, cattle — that you almost never hold directly. You own futures, a fund that holds futures, or shares of the companies that dig and grow the stuff. Cash is a deposit or a short-term bill: a claim on currency at face value, payable soon.
Those structures explain almost everything that follows. Debt has a maturity and a real yield. Goods have storage costs and a spot price that moves with supply and demand. Cash has no duration and no upside. Protection mechanism, liquidity and cost all fall out of those basics.
TIPS: a contractual claim on the CPI
A TIPS carries a fixed coupon rate, but the principal it is applied to rises with the consumer price index. Coupons are paid on the adjusted principal, and at maturity you receive the greater of the adjusted principal or the original amount — so a stretch of deflation cannot push your repayment below par. That is the whole trick, and it is a good one: you know in advance that your return is a real return, not a nominal one that inflation can eat.
The catch is that the market knows this too. TIPS trade at a real yield, and the gap between that real yield and the yield on an ordinary Treasury of the same maturity is the breakeven inflation rate. Buy TIPS and you are effectively saying inflation will run hotter than the market expects. If it merely meets expectations, you have gained nothing over nominals except the certainty.
The costs that don’t appear on the statement
- Price risk. TIPS still have duration. If real yields rise sharply, the price of a TIPS — or a TIPS fund — can fall even while inflation runs hot. The protection is contractual, not immediate.
- Tax drag. In a taxable account, the annual inflation adjustment to principal is generally taxed as income in the year it accrues, even though you receive it at maturity. Many investors hold TIPS inside tax-deferred accounts for this reason.
- Your basket is not the CPI. Rent, health insurance, school fees and transport rise at their own pace. TIPS defend the index, not your life.
Liquidity is generally fine, especially through funds and ETFs; individual TIPS are less heavily traded than ordinary Treasuries but perfectly workable if you are not in a hurry. Other governments issue similar bonds — UK linkers track the retail prices index, euro-area linkers track euro-area inflation — and they behave in broadly the same way.
Commodities: real assets, unreal volatility
Commodities are the hedge that looks best on a chart of a supply shock and worst on a chart of everything else. When demand outruns supply, physical prices rise, and that is precisely the kind of inflation that hurts a bond portfolio. The logic is appealing: you own the thing whose price is going up.
The execution is messier. Futures-based funds must periodically sell expiring contracts and buy later ones. If later contracts are more expensive — a condition called contango — the fund bleeds a little on every roll, and it can lose money while the spot price stands still. In backwardated markets the roll works in your favour. This is why two commodity funds tracking similar raw materials can produce very different returns.
What the volatility buys you
Commodities pay no interest and no dividend, and holding costs are real. Prices are driven by weather, inventories, geopolitics and Chinese construction cycles as much as by monetary conditions. Producer equities are a different animal again: they carry operating leverage and stock-market beta, and they can fall hard in a recession even when consumer prices are still rising. Treat commodity exposure as a small satellite position, prefer broad diversified indices to single-material bets, and check the roll methodology and expense ratio before you buy anything.
Cash: the reliable short-run hedge
Short-term interest rates follow policy and market expectations, which means they follow inflation — with a lag. When rates are above inflation, cash delivers a positive real return with almost no drama. When rates are below it, as they often are in the early stage of an inflation surprise, cash loses purchasing power in plain sight.
What cash does better than either of the other two is stay liquid and stay predictable. There is no duration risk, no roll cost, no counterparty puzzle if you stick to insured deposits and Treasury bills. That makes it the right home for money you will spend within a year or two, for an emergency reserve, and for the “dry powder” you want available when prices fall elsewhere. What it is not is a long-run inflation hedge; over decades, cash reliably loses ground.
Stress-testing the three across inflation regimes
The question is not whether an asset rises with inflation. It is what that asset costs you while inflation is quiet.
- Demand-driven inflation with strong growth. Commodities often lead. TIPS accrue CPI adjustments, but real yields may climb and cap their prices. Cash lags, then catches up as policy tightens.
- Supply shock and stagflation. Commodities can spike, then whipsaw. TIPS keep accruing, which is their quiet virtue. Cash lags badly until rates adjust.
- Disinflation and deflation. Cash wins in real terms. TIPS hold their nominal floor at maturity but can trade poorly in the meantime. Commodities are usually the worst place to be.
- Low, stable, expected inflation. TIPS are priced for it and offer little edge. Commodities drift back to supply and demand, often sideways for years. Cash roughly treads water.
How to choose a mix
Think in layers rather than picking a champion. Keep an emergency reserve and near-term spending in cash, where liquidity is the point. Use TIPS or a short-duration TIPS fund for the portion of your savings you want contractually tied to the index — and place them where the tax treatment is kindest. If you want commodity exposure, size it as insurance you can afford to hold through a bad decade, not as a trade.
Ask yourself three questions before allocating anything: how long until I need this money, how much drawdown can I genuinely tolerate, and am I defending the CPI or my own cost of living? Rebalance on a schedule rather than on headlines. And if the sums are meaningful, run the plan past a fee-only adviser and a tax professional — the structure of the account often matters as much as the asset inside it.
Photo: fielperson / Pixabay
