# Concavity and Inflection Points

Concavity deals with a functions 2^{nd} derivative of f(x) and measures the rate of change of the derivative (*not the original function). Functions can be either concave up if the 2nd derivative is positive, or concave down if the 2nd derivative is negative. In this video we further discuss concavity as well as inflection points which are places where a function changes concavity.