Surplus cash arises when a company's cash inflows exceed its cash outflows. Companies hold surplus cash for transaction, precautionary, and speculative motives rather than immediately investing it. There are tradeoffs between risk, liquidity, maturity, and return that must be considered when determining how to invest surplus cash. Risks include unsystematic (diversifiable) risks that affect individual companies and systematic (non-diversifiable) risks that affect the overall market. Common options for investing surplus cash include retail bank accounts, marketable securities like bonds, and other investments.