Geometric Measurement of Price-Elasticity of Supply

The geometric measurement of price-elasticity of supply can be obtained with the help of Fig. 2.20. Suppose, the supply curve of a good is the curve SS which is given in this figure. Also suppose, intend to obtain the geometrical measure of the coefficient of price-elasticity of supply (ES) at the point R (OP, OQ) on the supply curve SS. [...]