Commodity currency
Family IX · Macro
Not to be confused with forex currency trading, currency devaluation, currency intervention.
Commodity currency is a term used in foreign exchange analysis for a currency whose external value tends to move with the world price of a major export commodity. The link arises because commodity sales dominate the country's export earnings, fiscal revenue and overall growth, so shifts in that price feed into trade balances, interest-rate expectations and capital flows. The Australian and Canadian dollars, the Norwegian krone and the New Zealand dollar are common examples, though the strength of the relationship varies over time.
How the link works
A rise in the relevant commodity price improves the terms of trade: export revenue increases relative to import costs. That can widen the trade surplus, lift national income and encourage the central bank to tighten policy, all of which tend to support the currency. A fall in the commodity price works in reverse.
The relationship is not mechanical. It depends on the commodity's share of exports, whether production is state-controlled, the exchange-rate regime and global risk appetite. A currency may be called a commodity currency even when the correlation is only moderate or has weakened in recent years.
Worked example
Suppose a country exports iron ore and its currency is quoted at 0.7000 against the US dollar. Historically, a 10% rise in the iron ore price has been associated with an average 3% appreciation of the currency, other things equal.
The 0.3 sensitivity is illustrative; actual estimates differ by commodity, sample period and model specification.
What it is not
A commodity currency is not the same as a commodity itself, nor is it a currency backed by a physical commodity. It is a classification based on observed economic exposure, not a legal or fixed property. The label can also apply to a currency whose country exports several commodities, in which case no single price dominates.
Often confused with
- forex currency trading
- Forex currency trading is the activity of buying and selling currency pairs, whereas a commodity currency is a category of currency defined by its economy's export dependence; the visible sign is that one describes a market activity and the other describes a currency's characteristics.
- currency devaluation
- Currency devaluation is a deliberate official reduction of a fixed exchange rate, while a commodity currency is a floating-rate currency whose value is influenced by commodity prices; the visible sign is that devaluation is a policy action and commodity currency is an economic classification.
- currency intervention
- Currency intervention is central-bank buying or selling of foreign exchange to influence the rate, whereas a commodity currency is a currency whose market rate tends to track a commodity price; the visible sign is that intervention is an operation and commodity currency is a descriptive label.