A financial system is a system that allows the exchange of funds between financial market participants such as lenders, investors, and borrowers. Financial systems operate at national and global levels.[1] Financial institutions consist of complex, closely related services, markets, and institutions intended to provide an efficient and regular linkage between investors and borrowers.[2]
https://en.m.wikipedia.org/wiki/Financial_system
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Wikipedia 
See Money
See Monetary Economics, wikipedia