show what happens in the transition from the short run to the long run.
Answers
The transition from the short-run to the long-run may be done by considering some short-run equilibrium that is also a long-run equilibrium as to supply and demand, then comparing that state against a new short-run and long-run equilibrium state from a change that disturbs equilibrium, say in the sales-tax rate, tracing out the short-run adjustment first, then the long-run adjustment. Each is an example of comparative statics. Alfred Marshall (1890) pioneered in comparative-static period analysis. He distinguished between the temporary or market period (with output fixed), the short period, and the long period. "Classic" contemporary graphical and formal treatments include those of Jacob Viner (1931), John Hicks (1939), and Paul Samuelson (1947). The law is related to a positive slope of the short-run marginal-cost curve.