Question: The difference between a random walk and a sub martingale is the expected price change in a random walk is ______ and the expected price

The difference between a random walk and a sub martingale is the expected price change in a random walk is ______ and the expected price change for a sub martingale is ______.

A. positive; positive

B. positive; zero

C. zero; positive

D. positive; negative

E. zero; zero

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