Why Singapore Uses Exchange Rate Policy Instead of Interest Rates

Singapore’s monetary policy stands out globally because it focuses on managing the exchange rate rather than adjusting domestic interest rates. This unique approach is led by the Monetary Authority of Singapore (MAS), which guides the Singapore dollar through a managed exchange rate framework known as the Singapore dollar nominal effective exchange rate, or S$NEER. Instead of setting benchmark interest rates, MAS adjusts the policy band within which the S$NEER can move, allowing the currency to strengthen or weaken against those of Singapore’s major trading partners.

The main reason Singapore uses exchange rate–based monetary policy is its economic structure. Singapore is a small, highly open, and trade-dependent economy. Total exports and imports of goods and services exceed three times the country’s gross domestic product, and close to 40% of domestic spending goes toward imports. Because imported goods and services play such a large role in daily consumption, changes in the exchange rate have a much stronger and more direct impact on inflation than domestic interest rates. When the Singapore dollar appreciates, import prices fall, helping to reduce overall inflation and ease cost pressures on households and businesses.

The S$NEER is a trade-weighted index that measures the value of the Singapore dollar against a basket of currencies from its key trading partners. MAS uses this index because what matters most for Singapore’s price stability is how the currency performs collectively, not against any single foreign currency. Rather than fixing the exchange rate, MAS allows the S$NEER to fluctuate within a confidential policy band. Market forces determine day-to-day movements, while the central bank intervenes only if the exchange rate moves outside the allowed range.

MAS can adjust three elements of the policy band: its slope, level, and width. The slope determines the pace at which the Singapore dollar appreciates or depreciates over time. The level, or midpoint, allows for an immediate shift in the exchange rate, often used during severe economic conditions. The width controls how much volatility is allowed. Since 2024, MAS has reviewed and announced its monetary policy settings quarterly, providing more timely guidance on economic and inflationary trends. This exchange rate–centered framework has proven effective in maintaining price stability in one of the world’s most trade-reliant economies.