The time diversification controversy, one of the most contentious issues in asset allocation, refers to the relationship between risk and the holding period. One of the aspects of this controversy is related to whether stocks become more or less risky than bonds as the holding period lengthens....

Academics, practitioners, and investors essentially agree that in the short term stocks are riskier than bonds. Which of these two assets is riskier in the long term, however, is controversial. This short article explores this issue by assessing long-term risk as suggested by Warren Buffett;...