This becomes apparent when the cumulative outflows and inflows, which are tabulated in the
last three lines of Figure 31.6, are plotted on a graph as in Figure 31.9 and 31.10. From these
it can be seen that cumulatively, the Chapter_27 13.01.38 13.01.38 13.01.38 13.01.38.pages a
positive cash flow (a mere $500) is in period 4.