The policy concerns a currency basket, not a fixed US-dollar price.
MAS uses the Singapore dollar nominal effective exchange rate, S$NEER, as its monetary-policy instrument. The currency is managed against a trade-weighted basket within a policy band. The band's slope concerns its intended path over time, its centre the level, and its width the range for fluctuations. A stronger currency path can restrain imported inflation in an open economy. This is distinct from setting a domestic policy interest rate as the main instrument.
- Singapore's monetary policy
- The Monetary Authority of Singapore (MAS) manages the Singapore dollar nominal effective exchange rate (S$NEER). This compares the dollar with a trade-weighted basket of currencies, giving more weight to more important trading partners, rather than only the US dollar.
- The policy band
- The band is a permitted range around an intended exchange-rate path. Its slope describes how that path changes over time, its centre is the level, and its width is the range for fluctuations.
- Slower is not falling
- Reducing a positive slope means slower intended appreciation. It eases policy relative to the previous stronger path, without necessarily causing depreciation or moving the centre down.
Interpret the framework
Why the exchange rate matters
Singapore imports many goods and inputs. A stronger Singapore dollar can reduce their prices in local currency and ease domestic price pressure, depending on how much sellers pass on. Domestic spending and wages still matter.
Policy parameters
Slope, centre and width are different. A width change alters the permitted range, so it cannot always be classified as simple tightening or easing without context.
Interest rates
Singapore's rates are influenced by global financial conditions and expectations under its open financial framework. MAS does not independently choose a conventional policy rate as a second main instrument alongside its exchange-rate target.
Intervention
Buying domestic currency against foreign currency can support its value; selling domestic currency can restrain it, other things equal. The operating framework manages a band, not a promise about every bilateral quotation.
Worked example: An upward path becomes less steep
A central bank reduces the slope of an appreciating currency band but leaves it positive. The centre and width are unchanged.
- The intended appreciation becomes slower; a positive slope still describes appreciation over time.
- This is an easing relative to the previous stronger path, not necessarily a depreciation or a lower band centre.
- A bilateral rate compares two currencies, such as the Singapore and US dollars. It can move differently from the basket index, so one USD quotation cannot describe the whole policy stance.
Watch out for this
A lower appreciation slope means the currency is being devalued.
A reduction from a steeper positive slope to a gentler positive slope means slower appreciation. Direction, speed and level are different.
Check your understanding
Which best describes a lower but still positive S$NEER-band slope?
- A fixed Singapore-dollar peg to the US dollar.
- An automatic fall in the band's centre today.
- A slower intended rate of appreciation relative to the previous path.