When trading commodity-related currencies such as the Australian dollar (AUD) and Canadian dollar (CAD), you must never focus on a single economic data point alone. Their exchange rate trends are actually the result of a tug-of-war between the dual forces of “commodity price fluctuations” and global “monetary policy shifts”. Especially when the US Federal Reserve (Fed) implements policy adjustments such as rate hikes or rate cuts, how does this shockwave transmit layer by layer? This article will deeply break down this complex linkage mechanism for you, helping you build a more logical analytical framework in the unpredictable forex market.
Diagram of the “two-layer impact” transmission mechanism of US Federal Reserve monetary policy shifts on commodity-related currencies
Before diving into monetary policy, we must first clarify the basic attributes of commodity-related currencies. As the name suggests, the economic lifelines of the countries behind these currencies are highly dependent on the export of specific raw materials.
The two most classic representatives in the market are none other than the Australian dollar and the Canadian dollar.
The direct correlation between the Australian dollar and iron ore, and between the Canadian dollar and crude oil
Why do commodity prices directly affect exchange rates? The logic behind this is very simple: trade surplus and capital inflows.
When iron ore or crude oil prices rise sharply, exporters in Australia and Canada can earn more foreign exchange (usually US dollars). In order to pay wages, taxes, and expand production domestically, they must convert the US dollars they hold into their own domestic currencies (the Australian dollar or Canadian dollar). This massive demand for currency conversion directly pushes up the value of that country’s currency in the market.
In addition, a commodity boom also attracts overseas investors to invest capital in developing local resources, and this capital inflow further expands demand for commodity-related currencies.
Transmission mechanism by which rising commodity prices push up the exchange rates of corresponding countries
After understanding the link between commodities and currencies, the next point to explore is: when the Federal Reserve’s monetary policy shifts, how does it create a “first-layer impact” on the commodity market?
Most global commodities (such as gold, crude oil, and copper) are priced in US dollars. When the US Federal Reserve begins a rate hike cycle and drives the US dollar higher, buying the same amount of commodities becomes more expensive for buyers holding non-US currencies.
This leads to cooling global demand, thereby suppressing commodity prices. This is the logic behind the common saying that a “strong US dollar weighs on commodities”. To gain a deeper understanding of the US dollar’s influence, it is recommended to read this US dollar strength guide and US Dollar Index DXY analysis. According to a 2026 research report by the Bank for International Settlements (BIS), there is a significant correlation between the strength of the US dollar and commodity prices.
In addition to the pricing effect, monetary policy tightening also affects the real economy. US rate hikes mean higher borrowing costs for businesses and individuals, which suppresses investment and consumption.
As the world’s largest economy, a slowdown in the US economy often drags down the pace of the global economy, thereby reducing real demand for commodities such as crude oil and industrial metals. When demand expectations decline, commodity prices are naturally the first to come under pressure. For commodity-related currencies that rely on exports, this is undoubtedly a negative factor.
In addition to directly hitting commodity prices, US policy adjustments also create a “second-layer impact” on central banks in countries such as Australia and Canada through interest rate differentials and capital flows.
When the Federal Reserve raises interest rates sharply, central banks in other countries usually face enormous pressure. If the Reserve Bank of Australia (RBA) or the Bank of Canada (BOC) does not follow with rate hikes, the “interest rate differential” between these two countries and the United States will widen.
If the central banks of commodity countries choose to stay on hold, the disadvantage from interest rate differentials will lead to depreciation of their currencies.
International capital chases returns. When US dollar assets (such as US Treasuries), can provide higher and safer risk-free returns, investors will choose to sell the Australian dollar or Canadian dollar and park their capital in the US dollar.
This large-scale capital outflow not only offsets the exchange rate support that commodity prices may bring, but may even trigger a deeper depreciation cycle. For investors who are enthusiastic about forex carry trades, the narrowing or widening of interest rate differentials is the core key in determining trading direction.
To turn theory into practice, let us simulate several common trading scenarios under monetary policy shifts and see how commodity-related currencies may react.
Classic Case: Such as the Early Stage of the Russia-Ukraine Conflict in 2022
In this extreme scenario, geopolitics caused crude oil and wheat prices to surge, while the United States rapidly raised interest rates due to high inflation.
Exchange rate reaction: The Canadian dollar and Australian dollar usually show resilience. Although a strong US dollar brings pressure, record-high commodity prices provide a strong buffer for these countries’ trade surpluses. At this time, commodity currencies may trade at high levels against the US dollar, while they may strengthen sharply against other non-US currencies (such as the yen or euro).
Classic Case: When Global Economic Recession Concerns Intensify
When the United States continues tightening monetary policy, causing the market to worry about an economic recession, weak industrial demand leads to sharp declines in commodities such as copper and crude oil.
Exchange rate reaction: This is the most unfavorable “double hit” scenario for commodity-related currencies. The disadvantage in interest rate differentials, combined with deteriorating terms of trade, will cause the Australian dollar and Canadian dollar to face enormous selling pressure. At this time, following the trend to short AUD/USD or CAD/USD is often a reasonable trading strategy.
Classic Case: The Early Stage of Global Economic Recovery
When the Federal Reserve starts a rate-cut cycle to stimulate the economy (monetary policy shifts toward easing), while recovering global manufacturing demand drives commodity prices higher.
Exchange rate reaction: This is the “golden age” for commodity currencies. A weaker US dollar causes capital to flow into markets with high interest rates and high growth expectations. Driven by the dual engines of commodity prices and capital inflows, the Australian dollar and Canadian dollar usually enter a strong appreciation trend.
[AUD/TWD Exchange Rate] 2026 Best Guide to Exchanging TWD for AUD and Trend Analysis
Very significant, especially for the Australian dollar. China is the world’s largest consumer of industrial metals. When China launches large-scale infrastructure or monetary easing policies, demand for commodities such as iron ore surges, which usually directly pushes up the Australian dollar’s exchange rate trend. Therefore, when trading the Australian dollar, you cannot only watch the Federal Reserve, but must also closely monitor China’s developments.
Yes. Although New Zealand is not mainly driven by oil or minerals, its economy is highly dependent on agricultural exports (such as dairy products and meat). Therefore, the New Zealand dollar also has the characteristics of a commodity currency. Its trend is not only affected by global agricultural product prices, but also has a very high correlation with the Australian economy.
Although the US dollar is the global pricing benchmark for commodities, the European Central Bank’s (ECB) monetary policy also affects global capital liquidity and risk appetite. If the eurozone implements monetary easing, it will boost market optimism toward global economic growth, thereby indirectly supporting commodity demand and related currencies.
A carry trade involves borrowing a low-interest-rate currency (such as the yen) and buying a high-interest-rate currency (such as the Australian dollar or Canadian dollar) to earn the interest rate differential. When central banks in commodity countries maintain relatively high interest rates due to inflation, and global risk appetite is healthy, this type of operation becomes quite active. However, when market turbulence triggers capital flight to safe havens, the unwinding of carry trades can cause commodity currencies to fall sharply, so investors need to pay special attention to risk management.
Trading commodity-related currencies is a three-dimensional game. Successful traders must pay attention to both the direction of Wall Street’s monetary policy and the dynamics of commodity demand in the real economy. We can see that the trends of currencies such as the Australian dollar and Canadian dollar are deeply affected by the two-layer impact of US Federal Reserve policy, from the US dollar pricing effect on commodities to the interest rate differential and capital flow game between central banks.
In the complex economic environment of 2026, by understanding the two-layer impact model and market reactions under different scenarios proposed in this article, you will be able to see through the complex trends of currencies such as the Australian dollar and Canadian dollar more clearly, and make wiser decisions in a changing market.
