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The principal difference between short run and long run profit maximization is that in the long run the quantities of all inputs, including physical capital, are choice variables, while in the short run the amount of capital is predetermined by past investment decisions. In either case, there are inputs of labor and raw materials.
A firm's short-run supply curve is the marginal cost curve above the shutdown point—the short-run marginal cost curve (SRMC) above the minimum average variable cost. The portion of the SRMC below the shutdown point is not part of the supply curve because the firm is not producing any output. [13]
The short-run AS curve is drawn given some nominal variables such as the nominal wage rate, which is assumed fixed in the short run. Thus, a higher price level P implies a lower real wage rate and thus an incentive to produce more output. In the neoclassical long run, on the other hand, the nominal wage rate varies with economic conditions ...
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 ...
The addition of a supply relation enables the model to be used for both short- and medium-run analysis of the economy, or to use a different terminology: classical and Keynesian analysis. [15] A main example of this is the Aggregate Demand-Aggregate Supply model – the AD–AS model. [15]
The short-run supply curve for a perfectly competitive firm is the marginal cost curve at and above the shutdown point. Portions of the marginal cost curve below the shutdown point are not part of the SR {\displaystyle {\text{SR}}} supply curve because the firm is not producing any positive quantity in that range.
The more time a producer has to respond to price changes the more elastic the supply. [5] [6] Supply is normally more elastic in the long run than in the short run for produced goods, since it is generally assumed that in the long run all factors of production can be utilised to increase supply, whereas in the short run only labor can be ...
The rationale behind Lucas's supply theory centers on how suppliers get information. Lucas claimed that suppliers had to respond to a "signal extraction" problem when making decisions based on prices; the firms had to determine what portion of price changes in their respective industries reflected a general change in nominal prices (inflation) and what portion reflected a change in real prices ...