汇率
"Exchange rate bands" allow markets to set rates within a specified range; edges of the band are defended through intervention. It provides a limited role for exchange rate movements to counteract external shocks while partially anchoring expectations. This system does not eliminate exchange rate uncertainty and thus motivates development of exchange rate risk management tools. On the margin a band is subject to speculative attacks. It does not by itself place hard constraints on policy, and thus provides only a limited solution to the time inconsistency problem. The credibility effect depends on accompanying institutional measures, a record of accomplishment and whether the band is firm or adjustable, secret or public, band width and the strength of the intervention requirement.