在微观经济中,efficientscale,economiesofscale以及constantreturnstoscale分别是什么意思?scale,economiesofscale以及constantreturnstoscale分别是什么意思?

Question

在微观经济中,efficient scale,economies of scale以及constant returns to scale分别是什么意思?
scale,economies of scale以及constant returns to scale分别是什么意思?

Answer 1

Minimum efficient scale (MES) is a term used in industrial organization to denote the smallest output that a plant (or firm) can produce such that its long run average costs are minimized. This concept is useful in determining the likely market structure of a market. For instance, if the minimum efficient scale is small relative to the overall size of the market (demand for the good), there will be a large number of firms. The firms in this market will be likely to behave in a perfectly competitive manner due to the large number of competitors.
Economies of scale, in microeconomics, are the cost advantages that a business obtains due to expansion. They are factors that cause a producer’s average cost per unit to fall as scale is increased. Economies of scale is a long run concept and refers to reductions in unit cost as the size of a facility, or scale, increases.[1] Diseconomies of scale are the opposite. Economies of scale may be utilized by any size firm expanding its scale of operation. The common ones are purchasing (bulk buying of materials through long-term contracts), managerial (increasing the specialization of managers), financial (obtaining lower-interest charges when borrowing from banks and having access to a greater range of financial instruments), and marketing (spreading the cost of advertising over a greater range of output in media markets). Each of these factors reduces the long run average costs (LRAC) of production by shifting the short-run average total cost (SRATC) curve down and to the right.
Constant returns to scale is an attribute of a production function. A production function exhibits constant returns to scale if changing all inputs by a positive proportional factor has the effect of increasing outputs by that factor. This may be true only over some range, in which case one might say that the production function has constant returns over that range.(Econterms)