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Economies of scale is related to and can easily be confused with the theoretical economic notion of returns to scale. Where economies of scale refer to a firm's costs, returns to scale describe the relationship between inputs and outputs in a long-run (all inputs variable) production function.
For example, if there are increasing returns to scale in some range of output levels, but the firm is so big in one or more input markets that increasing its purchases of an input drives up the input's per-unit cost, then the firm could have diseconomies of scale in that range of output levels.
If Y is a separable production set with a production value function f p, then (positive) economies of scale are present if f p (λx) > λf p (x) for all λ > 1 and f p (λx) < λf p (x) for all λ < 1. The opposite condition may be referred to as negative economies (or diseconomies) of scale.
If only diseconomies of scale existed, then the long-run average cost-minimizing firm size would be one worker, producing the minimal possible level of output. However, economies of scale also apply, which state that large firms can have lower per-unit costs due to buying at bulk discounts (components, insurance, real estate, advertising, etc.) and can also limit competition by buying out ...
Scope economies, or economies of scope, describe the aspect of production wherein cost savings result from the scope of an enterprise, as opposed to its scale (see economies of scale). Meaning, there are economies of scope where it is less expensive for firms to combine two or more product lines into one, than it is to produce each product ...
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