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HERFINDAHL INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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Lesson Contents
Unit 1: Intro
  • Definition
  • Market Structure Continuum
  • Real World Oligopoly
  • Structure And Behavior
  • Unit 1 Summary
  • Unit 2: Structure
  • Concentration
  • Concentration Ratios
  • Herfindahl Index
  • Entry Barriers
  • Unit 2 Summary
  • Unit 3: Behavior
  • Interdependence
  • Collusion
  • Merger
  • Unit 3 Summary
  • Unit 4: Analysis
  • Kinked-Demand Curve
  • Kinked-Demand Curve Analysis
  • Collusion Cost
  • Collusion Output
  • Game Theory
  • Unit 4 Summary
  • Unit 5: Evaluation
  • The Bad
  • The Good
  • Government Intervention?
  • Unit 5 Summary
  • Course Home
    Oligopoly

    • The first unit of this lesson, A Few Firms, begins this lesson with a look at the nature of oligopoly and how it is related to other market structures.
    • In the second unit, Structure, we see how markets with a small number of large firms are structured.
    • The third unit, Behavior, then looks at some of activities undertaken by oligopoly that are not seen in other market structures.
    • In the fourth unit, Some Graphs, we use a few graphs to examine different ways that oligopoly firms interact in the production of output.
    • The fifth and final unit, Taking Stock, then closes this lesson by considering the good and the bad of oligopoly and why it is often prone to government scrutiny.

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    RELATIVELY ELASTIC

    An elasticity alternative in which relatively small changes in one variable (usually price) cause relatively large changes in another variable (usually quantity). In other words, quantity is very responsive to price. Quantity changes a lot in response to small changes in price. This characterization of elasticity is most important for the price elasticity of demand and the price elasticity of supply. Relatively elastic is one of five elasticity alternatives. The other four are perfectly elastic, perfectly inelastic, relatively inelastic, and unit elastic.

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    Today, you are likely to spend a great deal of time at a going out of business sale looking to buy either a coffee cup commemorating the first day of spring or a printer that works with your stockpile of ink cartridges. Be on the lookout for slow moving vehicles with darkened windows.
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