Returns to a Variable Factor. The law of returns to a variable factor states that with the increase in the units of a variable factor, keeping other factors constant, the increase in total production becomes, after some point, smaller an smaller
In this case marginal product first increase then becomes constant and finally it declines and becomes negative. Thus, the law has three stages: increasing marginal returns; diminishing marginal returns and negative returns.
Returns to Scale. The term returns to scale refers to the change in output as all factor-inputs change by the same proportion in the long run.
The increase in output may be more than, equal to, or less that proportional go the given increase in factor-inputs, hence returns to scale out of three forms-increasing, constant and diminishing.
|S.N.||Returns to a Variable Factor||Returns to Scale|
|1||Operates in the short run||Operates in the long run.|
|2||Only the Quantities of factor are varied||All factor-inputs are varied in the same proportion|
|3||Changes in the factor-ratio.||No change in the factor-ratio|
|4||No change in the scale of production||Changes in the scale of production.|