The Monetary Authority of Singapore conducts monetary policy by managing a trade-weighted nominal effective exchange rate, reflecting Singapore's status as a small and open economy highly dependent on global trade and capital flows. This exchange rate is allowed to fluctuate within a policy band, with officials adjusting the slope, width, and central level of the policy band in order to maintain price stability. Although the MAS does not have an explicit inflation target, MAS officials consider that keeping core inflation just under 2.0 percent is consistent with overall price stability in the economy.

Officials review policy every six months in April and October but are also prepared to make adjustments at other times as required. Adjustments that strengthen the exchange rate are equivalent to a tightening of monetary policy, while adjustments that weaken the exchange rate are equivalent to a loosening of monetary policy.

The exchange rate affects the economy in a significant way, particularly for a small and open economy like Singapore. A stronger exchange rate tends to slow economic activity by making exports more expensive to foreigners, while a weaker exchange rate tends to stimulate economic activity by making exports less expensive to foreigners. The exchange rate also has a direct and indirect effect on prices in the domestic economy, with a stronger exchange rate tending to restrain inflation and a weaker exchange rate tending to push up inflation.