经济政策的“前后不一致性”指什么?为什么决策者会违背自己以前做出的宣言?在这种情况下，政策规则的优点是什么?
What is meant by the“time inconsistency”of economic policy? Why might policymakers be tempted to renege on an announcement they made earlier? In this situation, what is the advantage of a policy rule?
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