Constant returns to scale
A property of a function of one or several variables such that a uniform relative change in all of its arguments results in an equal relative change in the value of the function; also referred to as linear homogeneity. For example, a Cobb-Douglas production function exhibits constant returns to scale when the elasticities of all inputs with respect to output sum up to one.
Reference: Oxford Press Dictonary of Economics, 5th edt.
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