The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Share | Related Content From Boats to Brokers From the Dutch East India Company to Wall Street, the stock market has a long and storied history. Asset Allocation Consider how your assets are allocated and if that allocation is consistent with your time frame and risk tolerance. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.