Is a Random Walk stationary? If log-prices are assumed to follow a Random Walk, is that consistent with the Efficient Market Hypothesis?

Economics:
10th Edition
ISBN:9781285859460
Author:BOYES, William
Publisher:BOYES, William
Chapter9: Aggregate Expenditures
Section: Chapter Questions
Problem 8E
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Is a Random Walk stationary? If log-prices are assumed to follow a Random Walk, is that consistent with the Efficient Market Hypothesis?

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