In martingale pricing,the observed price of a stock follows a process which substitutes what variable for alpha?

Name: In martingale pricing,the observed price of a stock follows a process which substitutes what variable for alpha?
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In martingale pricing, the observed price of a stock follows a process that substitutes the risk-free rate for alpha. This is because martingale pricing assumes a risk-neutral world where prices are discounted at the risk-free rate.

In Martingale Pricing,the Observed Price of a Stock Follows a Process