please give me graphical representation of returns to scale.

In the graphical presentation of returns to scale, we assume that both labour and capital are increased in the same proportion. Thus, we present both the inputs on the same axis (horizontal axis). On the vertical axis, we present the output. The returns to scale is depicted by the following figures.

Fig. (a) presents Increasing Returns to Scale. Increasing Returns to Scale holds when a proportional increase in all the factors of production leads to an increase in the output by more than the proportion. This is presented by the increasing slope of the curve.

Fig. (b) presents Decreasing Returns to Scale. Decreasing Returns to Scale holds when a proportional increase in all the factors of production leads to less than proportionate increase in output. This is presented by the decreasing slope of the curve.

Fig. (c) presents Constant Returns to Scale. It holds when a proportional increase in all the factors of production leads to an equal proportional increase in the output. Here the slope of the curve remains constant. That is, it is a straight upward sloping line.

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