A portion of the financial market where financial instruments with high liquidity and very short maturities are being traded. It comprised of short-term securities such as negotiable certificates of deposit (CDs), banker’s acceptances, Treasury bills, commercial papers, municipal notes, federal funds, and repurchase agreements (repos). In general, these are very safe investments which yields a relatively low interest rate that is most suitable for temporary cash storage or short-term time horizons. Bid and ask spreads are quite small due to the huge size and high liquidity of the market.