Question: The difference between a martingale (random walk) and a submartingale process for stock prices is that the expected price change in a martingale is ,

The difference between a martingale (random walk) and a submartingale process

The difference between a martingale (random walk) and a submartingale process for stock prices is that the expected price change in a martingale is , and the expected price change for a submartingale is A. positive, positive B. positive, zero C. zero, positive D.zero, negative E. positive, negative

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