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PERFECT COMPETITION, SHORT-RUN PRODUCTION ANALYSIS: A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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Lesson 6: Market Supply | Unit 4: Determinants Page: 16 of 19

Topic: Ch...Ch...Changes <=PAGE BACK | PAGE NEXT=>

  • Supply, the whole range of prices and quantities
  • Quantity supplied, a specific quantity supplied at a specific price.
The difference between:
  • Change in supply, we are changing, moving, shifting, the entire supply curve, the whole set of prices and quantities is changing. The five determinants change the supply.
  • Change in quantity supplied, we have moved to a new quantity on an same supply curve. Only the price of the good changes the quantity supplied.
  • This difference lets us analyze cause and effect.
  • Don't confuse these two.

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DOUBLE COINCIDENCE OF WANTS

The requirements of a barter exchange that each trader has want the other wants and wants what the other has. Because everyone does not necessarily want everything, the lack of double coincidence of wants is a major obstacle in barter exchanges, especially for complex, modern economies like that fond in the United States. While double coincidence of wants is also essential for exchanges involving money, it is such an inherent trait of money that it is not a problem. By its very nature as a generally accepted medium of exchange, everyone WANTS money.

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