In this section we look at supermarket pricing, using differentiation to show that equilibrium price in monopolistic markets in higher than in competitive markets. (Duration 7 minutes 50 seconds). Part of a series of films from the METAL (Mathematics for Economics: enhancing Teaching and Learning) project that show how partial differentiation and integration are used to gain constructive insights into economics as a discipline. They are fundamental building blocks for a course of mathematics for economics. These video clips and animations can be viewed in isolation, or via the learning pathway links to related materials in a Question Bank.