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Returns to scale

In a productive process, the relation between an equal proportional change in all inputs and the resulting proportional change in output.

Returns to scale

If output rises by a larger proportion than inputs, there are increasing returns to scale. If output rises by a smaller proportion than inputs, there are decreasing returns to scale (this is different from the diminishing returns to scale.).

Reference: Oxford Press Dictonary of Economics, 5th edt.