因为课本是原文书 虽然用雅虎或google翻译还是觉得怪怪 老师教我们自己看 内容大意是 投资税收抵免和折旧冲销 原文 The investment tax credit first came into being in 1962,just after the recessio -n of 1960-61.The credit is essentially a percentage subsidy on investment.As i -t applied in the United State from 1962 through 1986,it subsidized investment in equipment only.The investment tax credit is part of the variable z in Equati -on 11.11(注1) for the rental price of capital.A 10 percent investment credit a -dds 0.1 to z.A permanent investment credit creates an incentive for a permanen -tly higher capital stock,so it stimulates a burst of net investment as the eco -nomy makes the transition to the higher stock. 注1:(1-u)R^K=(R+d)(1-z)P^K u=税收 R^K=资本租金价格 R=利率 d=折旧 z=抵减率 google翻译如下: 投资税收抵免首次诞生於1962年的衰退中，1960-1961杏用本质上士一个百分比补贴投资。 适用於在美国从1962年通过1986年，投资补贴在设备投资抵免。是变量z系列方程11.11 （注1）的租金价格。百分之十的投资信贷增加0.1永久性投资性代创造基力永久更高的资 本存量，因此，刺激了一阵投资净额为使经济过度到更高的股票。 我看的似懂非懂 是说增加投资税收抵免能刺激投资 就这样吗? 希望有人能指正或补充 3Q But there are pitfall in the systematic use of changes in the investment credit to stabilize the economy.If firms anticipate that an investment tax credit wil -l be enacted during a recession,then a forecast of a recession could lead fir -ms to hold back on investment and help bring on the recession.These are the fi -ndings of Lawrence Christiano of Northwestern University,whose work shows that the anticipation of changes in the investment tax credit can actually increase the volatility of investment. google翻译如下: 但也有缺陷的系统使用的变化，投资信贷稳定经济。如果公司预计，投资税收抵免在衰退 期间将被立法通过那预期的衰退可能会阻碍企业投资和加速衰退，这些是西北大学劳伦斯 克里斯研究表明的。预期的变化，使投资税收抵免实际上可以增加起伏不定的投资。 跟前一段一样半懂，是说因为预期所以投资税收抵免反而会加速经济衰退，只有这样吗？ 希望有人能提供更多意见　谢谢 第一次在这板发文　 如有错误　请大家见谅 --

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