Microeconomics › Section K · Monopoly and antitrust policy › Topic K.3

Regulating natural monopolies

For a water utility, breaking up the monopoly IS the harm: one pipe network is the whole point. So antitrust's usual medicine - split the firm, invite entry - is off the table, and the regulator's real question becomes subtler: how to control a monopoly that must be allowed to exist.

In this topic

  • Why the usual medicine fails
  • Four regulatory choices
  • Worked example: the four points, in numbers
  • The efficient-but-broke problem
  • Cost-plus regulation
  • Price-cap regulation
  • Public ownership and competition for the market
  • Worked example: choosing a regime
  • Common mistakes to avoid
  • Key takeaways

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