China's factory sector lost a little of its spring in July. According to the latest figures released on Monday, the country's RatingDog Manufacturing Purchasing Managers' Index (PMI) slipped to 50.9, down from 51.7 in June. Markets had penciled in a reading of 51.5, so the actual number landed below even those muted expectations. The print still points to manufacturing activity expanding, but the pace of that growth has clearly eased.
What stood out, though, was how little the number rattled the Australian Dollar. The Aussie is often treated as a proxy for China's economy, yet it showed almost no reaction to the PMI release. At the time of writing, the AUD/USD pair was trading up 0.18% on the day at 0.7035, a marginal gain rather than any meaningful swing.
Why a Chinese number matters so much to Australia
China is Australia's largest trading partner, which is exactly why the health of the Chinese economy has such a strong grip on the value of the Australian Dollar. When China is firing on all cylinders, it buys more raw materials, goods and services from Australia, lifting demand for the Aussie and pushing its value higher. The reverse plays out when Chinese growth disappoints and slows more than expected. That is why positive or negative surprises in Chinese data so often feed straight through to the Australian Dollar and its currency pairs.
Interest rates and the central bank
One of the single biggest forces behind the Australian Dollar is the level of interest rates set by the Reserve Bank of Australia (RBA). The RBA fixes the rate at which Australian banks lend to one another, and that in turn shapes borrowing costs across the wider economy. Its central mission is to keep inflation steady within a 2 to 3% band, which it does by nudging interest rates up or down as conditions demand.
When Australian rates sit relatively high compared with those of other major central banks, the Aussie tends to draw support, while relatively low rates have the opposite effect. Beyond conventional rate moves, the RBA can also lean on quantitative easing and tightening to steer credit conditions. Easing generally works against the Australian Dollar, whereas tightening tends to work in its favour.
Iron ore, the export that moves the currency
Australia is a resource-rich nation, and no single export carries more weight than iron ore. Based on 2021 figures, iron ore is the country's largest export, worth around $118 billion a year, with China as its main destination. Because of that, the price of iron ore can be a powerful driver of the Australian Dollar.
As a rule, when iron ore prices climb, the Aussie climbs with them, as overall demand for the currency rises. When iron ore prices slide, the Australian Dollar tends to weaken. Higher iron ore prices carry a second benefit too: they raise the odds of Australia running a positive trade balance, which is itself supportive of the currency.
The trade balance factor
The trade balance is another lever on the Australian Dollar. In plain terms, it is the gap between what a country earns from its exports and what it pays for its imports. If Australia produces goods that buyers around the world are eager to get their hands on, its currency gains value simply from that surplus demand, as overseas buyers snap up more of its exports than the country spends on imports. A positive net trade balance therefore strengthens the Aussie, while a negative one drags it lower.
Risk appetite rounds out the picture
On top of these economic drivers, the broader mood of the market matters as well. When investors are willing to take on riskier assets, a stance known as risk-on, that generally helps the Australian Dollar. When they retreat toward safe havens instead, a risk-off environment, the Aussie usually comes under pressure. In the case of July's PMI, even though the figure fell short of forecasts, the market's response stayed calm and the Australian Dollar largely held its ground.
