Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. Related Content Should You Tap Retirement Savings to Fund College? There are three things to consider before dipping into retirement savings to pay for college. Systematic Withdrawals in Retirement Taking regular, periodic withdrawals during retirement can be quite problematic. 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.