Question

How to find functions are concave or quasi concave?

Answer 1

quasi concave have two concave mirrors in it

Answer 2

quasiconvex function is a real-valued function defined on an interval or on a convex subset of a real vector space such that the inverse image of any set of the form. is a convex set. For a function of a single variable, along any stretch of the curve the highest point is one of the endpoints.