The Scope for Monetary Independence in Exchange Rate Target Zones Broad and Narrow.

Placing limits on the movement of economic fundamentals in order to maintain an exchange rate within a target zone also puts a target zone around interest rate differentials. The bandwidth of exchange rate and interest rate differentials target zones will be different except at one point; it is suggested that this point gives a useful partitioning of target zones into broad and narrow categories. For realistic parameter values, this occurs at an exchange rate target zone of plus or minus 3.2%.