Why can't you value a barrel of oil the way you value a share?
Equity analysis has an anchor: a company produces cash, and a share is a claim on some of it. Bond analysis has a stronger one: the contract states the payments and the dates. Both let you build a model, discount a stream, and produce a number you can argue about.
A barrel of oil pays nothing, ever. Discount zero at any rate you like and you get zero. So the entire discounting apparatus you have learned in other domains does not apply here at all — not "applies with adjustments", does not apply.
What a commodity is missing
Line the three up:
- A share — an ownership claim, with a residual right to profits, a vote, and in many cases a dividend. Value = present value of future cash flows.
- A bond — a contractual claim, with stated coupons and a stated repayment. Value = present value of a known schedule.
- A commodity — no claim on anybody. No issuer, no management, no accounts, no coupon. Nobody owes you anything. You own a thing.
There is no P/E ratio of copper, no book value of wheat, no earnings call for gold. The vocabulary simply doesn't transfer.
What replaces it: the balance
A commodity's value comes from use — what somebody will pay to consume it — and from the willingness of others to hold it until they do. Practitioners therefore replace the valuation model with a balance: supply, demand, and the inventory that absorbs the difference.
The arithmetic is deliberately mundane:
World oil demand of about 103 million barrels a day against supply of about 102.4 million barrels a day leaves a deficit of 0.6 million barrels a day. Over a 30-day month:
0.6 × 30 = 18 million barrels drawn out of inventories.
Repeat that for six months and 108 million barrels have come out of tanks that were not infinite to begin with. The balance does not tell you the price. It tells you the direction of pressure on storage, and storage is the buffer that stops price from having to do all the work. When the buffer is fat, an imbalance is absorbed quietly. When it is thin, the same imbalance has to be rationed by price — and that is where large moves come from.
The soft floor and the soft ceiling
With no intrinsic value to anchor to, two mechanisms provide loose reference points over long horizons.
The cost of production is a soft floor. If the highest-cost quarter of the world's copper mines need roughly $7,000 a tonne just to cover cash operating costs and the price sits at $6,000 for long enough, some of those mines suspend operations. Supply falls, and the balance tightens. This is a mechanism, not a timer: mines run at a loss for years rather than incur the cost of closing and restarting, so "eventually" can be a very long word.
Substitution and demand destruction form a soft ceiling. At a high enough price, aluminium replaces copper in some wiring, a utility switches from gas to coal, a food manufacturer reformulates away from an expensive oilseed, and drivers make fewer trips. Demand does bend — just far less, and far more slowly, than intuition suggests.
The consequence for return
A stock's return has two parts: price change and dividends. A bond's has two: price change and coupons. A commodity's has one — price change — minus the cost of holding it, whether that shows up as warehouse rent for a physical holder or as the roll for a futures holder.
That is worth sitting with. Every other asset class in this Academy pays you something for waiting. This one charges you. It does not make commodities good or bad; it makes them a different kind of instrument with a different reason for existing, which is why the last unit of this course spends its time on what you are actually holding rather than on whether to hold it.
In the data
A physical commodity's price history is a date and a price, month after month, and nothing else. Crude's is first below; under it, for contrast, one day of a share, whose history carries a second, adjusted price because dividends were paid.
The missing column is the lesson: there is no distribution to fold back in, so the commodity's price series already is the whole of the return, before whatever holding it cost you.
Try it now
- Five years of crude and five years of a dividend-paying share are below. Use Measure on each, first bar to last, and write the two percentage changes down.
- Now name what each line does not contain. The share paid a dividend every quarter of that window, and the line you are looking at has folded them back in. The barrel paid nothing, ever, and there is no second series anywhere that could add a missing cash flow to it. One of these two can be valued by discounting what it hands you; the other cannot, because it hands you nothing.
- Take the balance arithmetic above and redo it with a surplus of 0.4 million barrels a day. How many barrels go into storage over 90 days? (0.4 × 90 = 36 million.) Then write one sentence explaining why "this commodity is cheap" is a harder claim to defend than "this share is cheap". If your sentence mentions the absence of cash flows, you have the lesson.