Small amounts of cash are kept in offices and departments in case of emergencies. Programs that deal with small amounts of money use imprest. You put some extra cash in the box for small bills and coins. At each outpost, goods and services are sold. If there aren't enough funds in the account, add more. Even small amounts of money that a company can control and use make it safer and more reliable. No matter how small, every financial transaction is written down and kept track of. Small financial investments quickly add up. Visit website for more details:  https://blog.happay.com/petty-cash-management/