The money market consists of loans, debts, and other highly marketable investments that can offer investors a steady but safe income stream. Getty Images The money market is a financial exchange where banks and companies buy and sell short-term debt securities. Money market investments like T-bills and CDs are safe and very liquid, paying reliable interest. Money market accounts and money market funds are common ways that individuals can invest in the market. Visit Business Insider's Investing Reference library for more stories. Money market accounts and money market funds are common investments: Odds are you've often seen them advertised by banks or financial services companies.