Burton G. Malkiel, the Princeton professor who brought Efficient Market Theory to the mass market in his classic A Random Walk Down Wall Street has taken up the defense of buy and hold investing, and the idea of diversification more broadly.
Ever since the trauma of 2008 when so many global asset classes moved down in tandem, there’s been ample discussion of the merits of diversified portfolio building. Many assets classes have continued to be highly correlated.
None of it’s convinced Malkiel. In a strongly worded defense on the Wall Street Journal’s opinion page, adapted from his introduction to the upcoming 10th edition of Random Walk, he remains as convinced as ever that the average investor should own a diversified portfolio made up of cost-effective index funds and contribute to it regularly and rebalance periodically to take advantage of the benefits of dollar cost averaging. Continue reading