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Here are the nominal returns on stocks, bonds, and bills for the 1920s and 1930s. For each decade, calculate the standard deviation of returns for each asset class. How do those figures compare with the more recent numbers for stocks presented in Table 6.3 and the long-run figures for all three asset types in Table 6.4? Source: Dimson, Elroy, Triumph of the Optimists. 2002 Elroy Dimson, Paul Marsh, and Mike Staunton. Published by Princeton University Press. Reprinted by permission of Princeton University Press