What Can a Million Dollars Buy You? $1 million in a diversified portfolio could help finance part of your retirement. Share | Related Content 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. A Look at Diversification Diversification is an investment principle designed to manage risk, but it can't prevent against a loss. Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.