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THEORY: A scientifically verified, interrelated body of general principles, axioms, and assumptions that is used to explain and understand real world phenomena. Theories are the cornerstone of the scientific method. They generate the hypotheses that are verified against real world data, which is the day-to-day process of doing science. The construction and refinement of theories, accomplished through the hypothesis verification process, is also the basic goal of doing science.

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Lesson 9: Consumer Demand | Unit 3: Marginal Utility Page: 12 of 22

Topic: Diminishing Marginal Utility <=PAGE BACK | PAGE NEXT=>

  • The law of diminishing marginal utility is a principle stating that as more of a good is consumed eventually each additional unit of the good provides less additional utility; that is, marginal utility declines as the quantity consumed increases.

  • These declining marginal utility values illustrate the law of diminishing marginal utility.
  • The law of diminishing marginal utility is the key principle for understanding market demand and the law of demand.

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LONG-RUN AVERAGE COST CURVE, DERIVATION

The long-run average cost curve is the envelope of an infinite number of short-run average total cost curves, with each short-run average total cost curve tangent to, or just touching, the long-run average cost curve at a single point corresponding to a single output quantity. The key to the derivation of the long-run average cost curve is that each short-run average total cost curve is constructed based on a given amount of the fixed input, usually capital. As such, when the quantity of the fixed input changes, the short-run average total cost curve shifts to a new location.

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