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In this paper, we calculate the consumer surplus of the quadratic demand function p=a?bx1?cx12 and the producer surplus of the quadratic supply function p=d?ex1?gx12 where x is a crisp quantity and a, b, c, d, e, g are polygonal fuzzy numbers. Polygonal fuzzy number is generalization of triangular fuzzy number. This type of fuzzy number was introduced by Baez et al. [A.D. Baez-Sanchez, A.C. Moretti, M.A. Rojas-Medar, On polygonal fuzzy sets and numbers, Fuzzy Sets and Systems, 209 (2012) 54-65.]. For a fixed parti...

Let the linear demand function be ??0(??)=??0???0??,0??????0??0, where ??0,??0>0 and ??0(??) is the unit price with respect to the demand quantity ??.Then the revenue function is ??0(??)=??0?????0??2 where 0??????0??0 . Consider the cost function ??0(??)=??0+??0?? where 0???, ??0>0 and 0<??0<??0. Then we obtain profit function as ??0(??)=??0(??)???0(??)=??0?????0??2???0???0?? where 0??????0??0 . Yao and Lin [Yao J.-S., Lin D.-C., Optimal fuzzy profit for price in fuzzy sense, Fuzzy Sets and Systems 111, 455-464 20...