That is, it is a straight line with a slope of-w/r. The figure shows a family of such lines, each corresponding to a different level of costs; lines further from the origin indicate higher total costs. A producer will choose the lowest possible cost given the technological trade-off outlined by curve II. Here, this occurs at point 1, where IT is tangent to the isocost line and the slope of II equals-w/r(f these results seem reminiscent of the proposition in Figure 3-5, that the economy produces at a point on the production possibility frontier whose slope equals minus Pc/FF, you are right: The same principle is involved.) Now compare the choice of land-labor ratio for two different factor price ratios. In Figure 4A-2 we show input choice given a low relative price of labor, (wlr), and a high rel ative price of labor, (w/r)2. In the former case the input choice is at 1: in the latter case at 2.