# Opportunity cost on PPC

Hi, I'm trying to learn opportunity cost and this is an image I took from Khanacadmeny. They said that due to the bowed out shape, it means that there is an increasing opportunity costs of production. Does it mean increasing opportunity cost of producing basketballs when the curves moves along the x axis? Such that at point(6,6), there is a greater opportunity cost of producing basketballs compared to (3,7.5), which is the efficient point located on the left? Would this also work in reverse? Such as the opportunity cost of making fidget spinners is higher at point (3,7.5) compared to (6,6) since you are giving up more basketballs? Thanks!

• This is almost a good answer, but as you appear to realise relies in the second paragraph on an inappropriate use of $dy/dx$. What would be much better would be to use $dy/dx$ correctly, as a gradient at a point, and to use the chart to estimate by eye its values (which will be negative as the curve slopes down and to the right) at the points (3, 7.5) and (6,6|). Aug 25, 2021 at 19:00