1. When studying the effects of changes in public policy, economists believe that
2. a.it is important to distinguish between the short run and the long run.b.the assumptions used in studying those effects should be the same for the short run as for the long run.c.the long-run effects of those changes are always more beneficial to society than are the short-run effects.d.the short-run effects of those changes are always more beneficial to society than are the long-run effects.