why is ppc downward sloping from left to right?
Production possibility curve (PPC) is a curve which shows the different combination of two goods that can be produced using given resources and given level of technology. It is a downward sloping concave curve. Since the resources are scarce and there is a given level of technology in the short run, in order to have an extra unit of one good, it is necessary to sacrifice some units of other good. There exists a trade-off between the production of two goods. So PPC slopes downward from left to right.