Why does Supply slope upwards? (The law of increasing opportunity cost and supply)

In a previous lesson we introduced the law of supply and the determinants of supply, but we never clearly explained WHY there is a direct relationship between price and quantity supplied. In this lesson we will connect the law of supply to a law introduced in an earlier lesson on the PPC and the Law of Increasing Opportunity Costs.

The concept of increasing marginal costs of production will be explained and the link between firms’ marginal costs and supply will be established in this lesson.

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