The aggregate demand and aggregate supply curves of the textbooks (derived from IS-LM) are market-equilibrium curves, not demand or supply in the micro sense. Nevertheless, they form the basis for more conventional schedules, such as a locus of effective demand as a function of P or r. IS-LM, of course, contain all relevant variables--S, I, L, M/P, etc. See my paper with Sheng Hu, "The Stability of Macro Models," in Essays in Contemporary Fields of Economics, Purdue University Press, 1981. George Horwich