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Wednesday, May 27, 2009

Using Interest Rate Differentials as Fundamental Trading Strategy

By Ahmad Hassam

As a forex trader, you should know that interest rates are an integral part of investment decisions and can drive the currency markets as well as the stock markets either direction. Federal Open Market Committee rate decisions are the second largest currency market moving release behind the unemployment figures.

The impact of interest rate changes is not only short term but also long term on the currency markets. One Central Banks interest rate decision can affect more than a single currency pair in the interconnected forex markets.

In forex trading, an interest rate differential is the difference between the base currency and the counter currency interest rate. In the pair, EUR/USD, Euro is the base currency and US Dollar is the counter currency. The interest rate differential for the EUR/USD currency pair will be the difference between the Euro and the US Dollar interest rate.

Understanding the relationship between the interest rate differentials and the currency pairs can be very profitable. In addition to the Central Banks overnight interest rate decisions, expected future overnight rates as well the expected timing for the rate changes can be critical to the currency pair movements.

The reason why this is profitable is that international investors like big banks, corporations, hedge funds and institutional investors are yield seekers. They actively keep on shifting their funds from the low yield assets to high yield assets.

Interest rate differentials are considered to be the leading indicators for currencies. London Inter Bank Offer Rate (LIBOR) and the 10 year government bond yields are usually used as leading indicators of currency appreciation or depreciation.

Lets take an example, suppose the Australian 10-year government bond yield is 5.25%. The US 10-year government bond yield is 1.75%. The yield spread in this case would be 350 basis points in favor of the Australian Dollar.

Suppose the Australian government raised its interest rate by 25 basis points. The Australian 10-year government bond yield would also appreciate to 5.50%. Now, the new yield spread is 375 basis points in favor of the Australian Dollar (AUD). The AUD will also be expected to appreciate against USD overtime.

The general rule of thumb used is that when a yield spread increases in favor of a certain currency that currency is expected to appreciate against other currency in the currency pair. This is important information for you as a trader in telling you before hand about the change in currency price. Up to date interest rate data is available on Bloomberg. Keep track of the currencies in the pairs that you trade with that data. - 23196

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