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In other words, returns to scale analysis is a long-term theory because a company can only change the scale of production in the long run by changing factors of production, such as building new facilities, investing in new machinery, or improving technology.
New trade theorists relaxed the assumption of constant returns to scale, and showed that increasing returns can drive trade flows between similar countries, without differences in productivity or factor endowments. With increasing returns to scale, countries that are identical still have an incentive to trade with each other.
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.
The engine for growth can be as simple as a constant return to scale production function (the AK model) or more complicated set ups with spillover effects (spillovers are positive externalities, benefits that are attributed to costs from other firms), increasing numbers of goods, increasing qualities, etc. [citation needed]
The presence of increasing returns means that a one percent increase in the usage levels of all inputs would result in a greater than one percent increase in output; the presence of decreasing returns means that it would result in a less than one percent increase in output. Constant returns to scale is the in-between case.
Under constant returns to scale, doubling both capital and labor leads to a doubling of the output. Since outputs are increasing in both factors of production, doubling capital while holding labor constant leads to less than doubling of an output.
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If the coefficient is 1, then production is experiencing constant returns to scale. Note that returns to scale may change as the level of production changes. [2] A different usage of the term "output elasticity" is defined as the percentage change in output per one percent change in all the inputs. [3] The coefficient of output elasticity can ...