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Lecture 18 - Imperfect Information: Information Sets and Sub-Game Perfection

Uses information sets to represent what players cannot distinguish, then introduces subgame perfection for games with sequential and simultaneous components.

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Why it is here

Watch after basic sequential games to learn why drawing moves in time order does not by itself describe what a decision-maker knows.

Selection basis: institutional collection. Reason checked 2026-11-07 by agent.

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Editorial judgement: the official course requires introductory microeconomics and uses one-variable calculus, probability and expectation. The introductory subject title does not mean that no preparation is needed.
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Open Yale Courses; original source https://oyc.yale.edu/economics/econ-159/lecture-18. Link by default. Source terms require credit to original faculty, Yale and the course URL, plus licence. Inspect individual credits before copying. Commercial reuse and third-party assets require separate review.. Links, factual metadata and original navigation annotations only. No source page, transcript, image, video or restricted platform metadata is included in the reusable export.

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    About the Course and Requirements sections read, including explicit mathematics and economics prerequisites. Retrieved 2026-11-07.

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