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Spot a Random Walk

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A test for randomness

One of the lines is a random sample of 100 consecutive days for the price of a specific stock. The other one is a random walk. Can you guess which one's which?
This is a replication of now defunct website that was floating around in the early 2000s.

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Solution Concepts

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(work in progress)

A graph of all solution concepts in economics by inclusion. It shows all equilibrium concepts with references, indicating generalizations/refinements with arrows. It is largely a perpetual work in progress.