Fixed, Variable, and Marginal Cost.

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/short-run-production-costs/v/fixed-variable-and-marginal-cost Thinking about average fixed, variable and marginal cost More free lessons at: http://www.khanacademy.org/video?v=bBQVaRnHqLs