(2) Problems 2 on page 60, 9th edition; page 62, 10th edition On the same figure, graph national saving and investment as fractions of real GDP, using quarterly U.S. data

since 1947. (Note that national saving is called gross saving in the FRED database.)How does the behavior of these variables in the past ten years compare to their behavior in earlier periods? How is it possible for investment to exceed national saving, as it does in some periods?