The Common Failure of Asset Allocation

Most investors agree that the biggest decision in investing is asset allocation, but few agree on what the best asset allocation strategy is: from “Stocks for the Long-Run” and “Random Walk Down Wall Street”, to “Endowment Style” and “Risk Parity” to “Factor-Based Investing” and “Dynamic Asset Allocation”.

Why do so many investors fail to achieve the average returns that various asset allocation approaches provide over the long-run?