Commodities Explained / Supply and Price Drivers

Trace currency and financing effects without relying on a fixed rule that commodities always move opposite to the dollar.

Start with the buyer’s currency

Many international benchmarks are quoted in U.S. dollars. A buyer using another currency cares about the local currency cost after conversion. A change in the exchange rate can alter affordability even if the dollar quote is unchanged.

This does not create a guaranteed inverse relationship between the dollar and every commodity. Supply shocks, demand changes and investor behaviour can outweigh or interact with currency effects.

Worked currency example

A hypothetical input costs $100 per unit. If one dollar initially costs 4 units of a buyer’s currency, the local cost is 400. If the exchange rate moves to 4.4 while the dollar price stays unchanged, the local cost becomes 440, a 10% increase before other expenses.

If the dollar price then falls to $95, the local cost is 418. A 5% decline in the dollar quote has not eliminated the original increase for this buyer.

Financing and opportunity costs

Holding inventory can require borrowed funds or capital that could be used elsewhere. Higher financing costs can change the economics of storing material for later sale. The effect depends on storage costs, availability and prices for different delivery dates.

A physical metal holding does not itself generate interest. Investors may compare it with interest bearing assets, but that comparison also depends on inflation expectations, risk preferences and the purpose of the holding. Nominal interest rates alone are an incomplete explanation.

Separate the exposures in a portfolio

A mining company may sell output in dollars while paying some costs in another currency. A fund’s trading currency may differ from the currency of its assets. A currency hedged share class introduces another set of rules and costs.

Write down the revenue currency, cost currency and investor reporting currency. Then test them separately. A plausible macroeconomic story becomes more useful when it identifies a measurable channel rather than just two chart lines that once moved together.

Put it into practice

In the example, what is the total local currency cost change from 400 to 418? Is it the same as the dollar commodity price change?

Check your answer

The local cost rises 4.5%. The dollar commodity price fell 5%. Currency translation changes the result experienced by the buyer.

Sources and further reading

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