"The trade of banks is the buying and selling of interest and exchange"

William Petty's quote is describing the practice of banking, which is the buying and selling of interest and exchange. Banks are banks that provide services such as loans, deposits, and financial investments. Banks earn money by charging interest on loans and collecting charges for services. They likewise earn money by buying and offering foreign currencies, which is known as foreign exchange. Banks likewise buy and sell securities, such as stocks and bonds, and other financial instruments. Banks are an important part of the global economy, as they supply a method for individuals to conserve and invest their money. Banks likewise offer a method for businesses to gain access to capital and finance their operations. Banks are essential for the functioning of the international economy, and the buying and selling of interest and exchange is an important part of their company.