假设政府想增加投资但保持产出不变。在IS－LM模型中。货币与财政政策如何配合才能实现这一目标？在20世纪80年代

假设政府想增加投资但保持产出不变。在IS-LM模型中。货币与财政政策如何配合才能实现这一目标？在20世纪80年代初，美国政府减税并有预算赤字，而美联储实施紧缩性货币政策，这种政策配合会有什么影响？

Suppose that the government wants to raise investment but keep output constant. In the IS-LM model, what mix of monetary and fiscal policy will achieve this goal？ In the early 1980s, the U.S. government cut taxes and ran a budget deficit while the Fed pursued a tight monetary policy. What effect should this policy mix have？