使用图书馆或互联网，找出美国政府债务占GDP百分比的未来路径的最近预测。关于政府支出、税收和经济增长做出了

哪些假设？你认为这些假设是合理的吗？如果美国经历了生产率增长的减缓，实际情况与这一预测会有什么不同？(提示：可看的一个好地方是www.cbo.gov)。

Using the library or the Internet, find some recent projections for the future path of the U.S. government debt as a percentage of GDP. What assumptions are made about government spending, taxes, and economic growth？ Do you think these assumptions are reasonable？ If the U.S. experiences a productivity slowdown, how will reality differ from this projection？ (Hint: A good place to look iswww.cbo.gov.)