Smetters, whose model is widely used in Washington D.C. to analyze the fiscal and macroeconomic effects of federal policy, has Beltway policy chops including a stint as an economist at the Congressional Budget Office and Deputy Assistant Secretary for Economic Policy at the U.S. Treasury. He has advised Congress on dynamic scoring, and consults with policymakers from both parties on major tax and spending legislation. Smetters has described PWBM as a “sandbox” for legislators to workshop economic policy ideas.
去年还说要登陆火星的马斯克，今年就变脸说要先登陆月球了？马斯克他的葫芦里到底卖的是什么药？
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If such an \(f\) exists, \(X\) and \(Y\) are called homeomorphic, written \(X \cong Y\).