Economists and policymakers must deal with ambiguity. The current state of
macroeconomics offers many insights, but it also leaves many questions open.
The challenge for economists is to find answers to these questions and to expand
our knowledge. The challenge for policymakers is to use the knowledge we now
have to improve economic performance. Both challenges are formidable, but nei-
ther is insuperable.
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example, an income tax system that automatically
reduces taxes when income falls.