Drunkard's Walk - Quant Trader Interview Question
Difficulty: Hard
Category: Probability & Statistics
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Topics: random-walk, probability, recurrence, transience, pólya-paradox
Problem Description
A confused trader is trying to navigate the market's ups and downs. Imagine their portfolio value as performing a symmetric random walk on a multi-dimensional integer lattice. In a 2-dimensional market (only two assets), it is known that the trader will, with probability 1, return to their starting portfolio value at some point in the future (recurrence).
Now, consider a more complex market with three assets. What can you say about the probability of the trader's portfolio value returning to its
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