The biggest issues with money market funds involve impulse buying of stuff you do not need and becoming a target for sales pitches from the sales force that sold you the money market fund. Money market funds can be tapped with checks, credit cards, and online transfers. Impulse buyers may want to avoid the opportunity to make quick purchases. Some brokers who are slightly unscrupulous tell money market fund owners that they should “put their money to work” and that “cash is trash.” Lured by potentially higher returns in stocks and other high-commission, high-spread investments, money market funds are easily and quickly converted. With CDs, you lose your interest if you liquidate before the term. Savings accounts often require several steps to convert into risky investments. Money market funds, particularly those attached to brokerage accounts, can be converted at the click of a mouse. If you are vulnerable to sales pitches or impulse buying, you may not want to own money market funds.