Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. 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. The New Red Scare: Chinese Ownership of U.S. Debt China owns a portion of the total outstanding debt of the U.S. Government. What does it mean? Keys to Investing for Retirement There are some key concepts to understand when investing for retirement.