假设国会通过一项宪法修正案，要求美国政府始终奉行平衡预算政策。这样，如果政府希望改变政府开支，则它必须同时等额改变税收，即△G=△T。该宪法修正案是否意昧着政府将无法采用财政政策来影响就业和产出了呢?(提示：分析在“平衡预算”条件下政府支出增加的影响，这里的政府支出增加必须与税收增加相同。) Imagine that Congress passes a constitutional amendment requiring the U.S. government to maintain a balanced budget at all times．Thus，if the government wishes to change government spending，it must change taxes by the same amount，that is，△G=△T always．Does the constitutional amendment imply that the government can no longer use fiscal policy to affect employment and output? (Hint：Analyze a“balanced-budget”increase in government spending，one that is accompanied by an equal tax hike．)