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Interest rates are the percentage charged on borrowed money or the return on investment gained by lending money. They are crucial in determining the flow of money across borders. When a country raises its interest rates, it becomes a more appealing place for investors to put their money. This is because investors look for opportunities where their funds can earn the highest returns.

For example, if the US raises its interest rates, investors might sell their currency holdings, like the Australian dollar, and instead buy US dollars to benefit from higher returns in the US. This shift can increase the demand for the US dollar, causing it to gain value, while the Aussie dollar may lose value. This aspect shows how interconnected global economies are, and how domestic policy changes in one country can affect currency values worldwide.

Interest rates affect not only currency appreciation and depreciation but also economic growth and inflation. Therefore, central banks carefully decide on changes in rates to stabilize their economies.

Foreign investment is the allocation of capital to another country with the expectation of returns. It plays a vital role in shaping currency exchange rates. When a country's economy offers competitive returns or stability, it attracts foreign investment. Investors buy that country's currency to invest, increasing demand for it and consequently its value.

For example, if the US raises its interest rates, it can attract more foreign investors seeking better returns than those available elsewhere. This increased investment increases demand for the US dollar, and as a result, its value appreciates in comparison to other currencies.

Investors consider factors like interest rates, economic stability, and potential for growth when deciding where to allocate their resources. Sudden or expected changes in these factors can result in significant shifts in foreign investment and thus currency values.

Currency depreciation refers to a decrease in the value of a country's currency relative to others. It can happen due to various reasons, including changes in interest rates, economic instability, or increased foreign debt. When a currency depreciates, it can make imports more expensive and exports cheaper.

In the scenario where the US raises its interest rates, the Australian dollar may depreciate if no similar action is taken by Australia to increase its own rates. This depreciation means that the Australian dollar becomes less valuable compared to the US dollar, making goods imported from the US more costly for Australia.

This kind of currency shift can make international investments unstable and may dissuade investors from investing in countries with weaker currencies. However, a weaker currency can sometimes boost a country's export economy, as their goods become more competitive abroad. Balancing these factors is crucial for maintaining economic stability.