ECON 2020 Lecture Notes - Lecture 19: Marginal Cost

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Econ2030 lecture 19 notes chapter 13 continued. Where average total cost and marginal cost is the efficient scale of production (the quantity that minimizes the average total cost) Costs in the short run and long run. Short run: some inputs are fixed (factories, land) Long run: all inputs are variable (firms can build more factories or sell existing ones) In the long run, the firm will choose to do whatever the cheapest option is. Cannot change size of factory in short run (atcs) Atcm will give us the lowest atc cheapest option is atcl. In the long run, a firm faces the lratc (red curve) Will pick whichever one is associated with lowest atc, so this firm will choose. How atc changes as the scale of production changes. Economies of scale: atc falls as quantity increases (if firm increases output, their cost per unit goes down: first arrow.

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