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Marshall's original introduction of long-run and short-run economics reflected the 'long-period method' that was a common analysis used by classical political economists. However, early in the 1930s, dissatisfaction with a variety of the conclusions of Marshall's original theory led to methods of analysis and introduction of equilibrium notions.
Prior to the financial crises of 2007-9, the majority new consensus view, still found in most current text-books and taught in all universities, was New Keynesian economics, which (in contrast to Keynes) accepts the neoclassical concept of long-run equilibrium but allows a role for aggregate demand in the short run. New Keynesian economists ...
With this assumption, we can re-express aggregate output in per capita terms (,) = (,) = For example, if we use the Cobb–Douglas production function with =, =, then () =. To obtain the first key equation of the Ramsey–Cass–Koopmans model, the dynamic equation for the capital stock needs to be expressed in per capita terms.
The long-run aggregate supply curve refers not to a time frame in which the capital stock is free to be set optimally (as would be the terminology in the micro-economic theory of the firm), but rather to a time frame in which wages are free to adjust in order to equilibrate the labor market and in which price anticipations are accurate. A ...
For instance, taking the first definition, if it costs a firm $400 to produce 5 units and $480 to produce 6, the marginal cost of the sixth unit is 80 dollars. Conversely, the marginal income from the production of 6 units is the income from the production of 6 units minus the income from the production of 5 units (the latter item minus the ...
Long-run marginal cost (LRMC) is the cost function that represents the cost of producing one more unit of some good. The idealized "long run" for a firm refers to the absence of time-based restrictions on what inputs (such as factors of production) a firm can employ in its production technology. For example, a firm cannot build an additional ...
Conversely, if firms are making negative economic profit, enough firms will exit the industry until economic profit per firm has risen to zero. This description represents a situation of almost perfect competition. The situation with zero economic profit is referred to as the industry's long run.
A long-run average cost curve is typically downward sloping at relatively low levels of output, and upward or downward sloping at relatively high levels of output. Most commonly, the long-run average cost curve is U-shaped, by definition reflecting economies of scale where negatively sloped and diseconomies of scale where positively sloped.