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 Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. A Primer on Dividends A company's profits can be reinvested or paid out to the company’s shareholders as “dividends." How Compound Interest Works Use this calculator to better see the potential impact of compound interest on an asset.