Step-by-step explanation:
The main role of banks in the nation's economy is to regulate the money supply between the surplus and the deficit economic agents. Banks in a country accepts people's deposits, give loans to people and charge interests on the given amount, issue treasuries and give interests on that, make profits through the difference between the interest rate paid and charged to the depositors and borrowers. Precisely, a bank helps a country's economy to regulate the supply of money by acting as an intermediary between the surplus and deficit agents of money.