How the US Dollar Affects Commodities and Global Markets
How the US dollar affects commodities and global markets: why a stronger dollar tends to weigh on oil and gold, how it tightens conditions for dollar borrowers abroad, what it does to US exporters, and why the relationship breaks in a crisis.
Most commodities are priced in US dollars, most cross-border debt is denominated in them, and most currency trades have one on one side. That makes the dollar a variable in almost every market's price, whether or not the market has anything to do with the United States. A stronger dollar is a headwind for commodities, emerging markets and US exporters at once — most of the time.
Key Takeaways
- Commodities are priced in dollars. A stronger dollar makes them dearer in every other currency, which tends to weigh on demand and on the dollar price.
- Gold is the clearest case: it trades inversely to the dollar most of the time, because it is the dollar's alternative.
- Emerging markets borrow in dollars. A stronger dollar raises the real burden of that debt.
- The relationship breaks in a crisis, when the dollar and safe-haven commodities can rise together.
The Channels
| Market | Channel | On a stronger dollar |
| Commodities (WTI, BRENT, XAGUSD) | Priced in USD; demand outside the US falls as local-currency prices rise | Tend to fall |
| Gold | The dollar's alternative store of value | Tends to fall — inverse most of the time |
| Emerging markets | Dollar-denominated debt; capital flows | Tighter conditions; currencies and equities under pressure |
| US exporters | Foreign earnings worth fewer dollars | Multinationals' reported earnings fall |
| Commodity currencies (AUD, CAD, NZD) | Both the dollar leg and the commodity leg move against them | Fall on both counts |
| Risk assets generally | Dollar strength often coincides with tighter global liquidity | Headwind |
Why Commodities Fall When the Dollar Rises
A barrel of Brent at $80 costs €74 at 1.08 and €80 at 1.00. A stronger dollar has raised the euro price by 8% without the oil market doing anything. Buyers outside the US see a higher price and, at the margin, buy less. The dollar price adjusts down to clear.
The relationship is not one-for-one and it is not constant. In a supply shock, oil rises regardless of the dollar. But over months, a persistently rising dollar is a persistent headwind, and a falling one a tailwind. See what is commodity trading and oil trading guide.
Gold: The Dollar's Mirror
Gold and the dollar are both things people hold instead of other currencies. When the dollar is strong, it is doing gold's job; when it weakens, gold is the alternative. The inverse relationship is among the more reliable in markets — with the real-yield channel behind it, since a stronger dollar often accompanies higher US real rates. See the relationship between gold, real yields and the US dollar.
Measuring the Dollar
The dollar index (DXY) measures the dollar against a basket of six developed-market currencies, weighted heavily toward the euro. It is the standard shorthand for "the dollar", with the caveat that it tells you little about the dollar against emerging-market currencies or the yuan. A broad trade-weighted index does better for the global picture.
Worked Example: One Dollar Rally, Four Markets
The dollar index rises 3% over a month on widening US rate expectations.
| Market | Move | Why |
| Gold (XAUUSD) | −4% | Dollar's alternative; real yields up |
| Brent | −6% | Dearer outside the US; demand at the margin |
| AUDUSD | −3.5% | Dollar leg and commodity leg |
| Emerging-market equity index | −5% | Dollar funding tighter; capital out |
A trader long gold, long AUDUSD and long oil held three positions and one short-dollar exposure. See correlated positions.
(Illustrative magnitudes.)
When the Relationship Breaks
In an acute crisis the dollar is bought as the global funding currency — obligations are in dollars and dollars are what is needed — and gold is bought as a haven. Both rise. Oil can rise on supply fear while the dollar rises on stress. The ordinary inverse relationships are growth-regime relationships; they give way in stress. See risk-on vs risk-off.
Why is oil priced in dollars?
Convention, dating from the dollar's post-war role as the reserve and settlement currency. Most global commodity contracts followed.
Does a weak dollar always mean higher gold?
Usually, but the real-yield channel can override it. A weak dollar with sharply rising real yields is not a clean tailwind.
What is DXY?
The US dollar index: the dollar against a basket of six major currencies, euro-heavy. A widely used shorthand with a narrow composition.
How does the dollar affect emerging markets?
Through dollar-denominated debt, which becomes more expensive to service when the dollar rises, and through capital flows, which tend to leave when US returns improve.
Is a strong dollar good or bad?
For US consumers and importers, good. For US exporters, commodity producers and dollar borrowers abroad, a headwind. For markets, the direction of change matters more than the level.
Related Reading
What is commodity trading · Oil trading guide · Gold, real yields and the US dollar · Risk-on vs risk-off · Correlated positions · How interest rates affect currencies, stocks, gold and bonds
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