William J. Brennan, Jr., United States v. Philadelphia National Bank…
“ Commercial banks are unique among financial institutions in that they alone are permitted by law to accept demand deposits. This distinctive power gives commercial banking a key role in the national economy. For banks do not merely deal in but are actually a source of, money and credit; when a bank makes a loan by crediting the borrower's demand deposit account, it augments the Nation's credit supply. ”
