An increasing returns to scale production function could be quasiconcave.

Question

Quizplus · Accepted Answer

It is possible for an increasing returns to scale production function to be quasiconcave. A quasiconcave function has the property that the set of points lying above the set of points where the function is zero is a convex set. This property can be satisfied by some increasing returns to scale production functions, as long as they satisfy certain conditions. However, it is not true that all increasing returns to scale production functions are quasiconcave.

An Increasing Returns to Scale Production Function Could Be Quasiconcave