Cash and its equivalents as well as other assets that can be easily converted into cash, or liquidated. Market liquidity refers to the ease with which a security can be bought or sold quickly and in large volumes without substantially affecting the market price. Markets or instruments are described as being liquid, or having depth, if there are sufficient buyers and sellers to absorb sudden shifts in supply and demand without extreme price movements. A liquid market is one where a large volume of business is conducted. The opposite of illiquid.