Understanding Currency Fair Value: A Fundamental Analysis Guide for Traders

In the short term, financial markets often resemble a ‘voting machine’ driven by momentum and irrational emotion. However, in the long term, markets transform into a ‘weighing machine’ that seeks equilibrium between supply and demand, and between greed and fear.

Fundamental analysis exists to dissect this long-term equilibrium by focusing on the structural factors that determine exchange rates. Its primary objective is to determine the fair value of a currency. Although long-term valuation is often considered less relevant for day traders, understanding it remains crucial for filtering out market ‘noise’.

Kar Yong Ang, a financial market analyst at broker Elev8, outlines several main approaches to measuring fair value and how to apply them in daily trading practice. One of the most well-known methods is Purchasing Power Parity (PPP). This theory states that an identical basket of goods in two different countries should cost the same once adjusted for the exchange rate. A popular application of this is the Big Mac Index, introduced by The Economist in 1986.

However, PPP has weaknesses as it assumes free trade without transaction costs or taxes. As a more comprehensive alternative, the Bank for International Settlements (BIS) provides the Effective Exchange Rate (EER) and its real version, the REER, which accounts for inflation and trade volume weights between partner countries.

Exchange rates are influenced by a complex interaction between global and domestic factors. Kar Yong Ang highlights seven main factors. Interest rates are the primary instrument of monetary policy that links the abstract concept of ‘fair value’ to daily market activity. Historically, central banks have had certain biases. Germany’s Bundesbank tended to be tight due to past hyperinflation trauma, while the US Federal Reserve (The Fed) often maintains low interest rates for longer to support economic growth.

For traders, the most practical method is to compare interest rates between countries via the yield spread. For example, on the AUD/USD currency pair, traders need to monitor the yield spread between Australian and US government bonds with 2-year or 10-year tenors. Generally, higher interest rates will encourage capital inflows, while low rates trigger outflows. This principle is highly reliable in developed country markets, although traders need to be more cautious when applying it in emerging markets.