Bank for International Settlements - The Role of Central Bank Money in Payment Systems. See page 9, titled, "The coexistence of central and commercial bank monies: multiple issuers, one currency": http://www.bis.org/publ/cpss55.pdf
A quick quote in reference to the 2 different types of money is listed on page 3. It is the first sentence of the document:
"Contemporary monetary systems are based on the mutually reinforcing roles of central bank money and commercial bank monies."
the reference is found in the "Money Manager" section:
"the Fed works to control money at its source by affecting the ability of financial institutions to "create" checkbook money through loans or investments. The control lever that the Fed uses in this process is the "reserves" that banks and thrifts must hold."
"At the beginning of the 20th almost the totality of retail payments were made in central bank money. Over time, this monopoly came to be shared with commercial banks, when deposits and their transfer via checks and giros became widely accepted. Banknotes and commercial bank money became fully interchangeable payment media that customers could use according to their needs. While transaction costs in commercial bank money were shrinking, cashless payment instruments became increasingly used, at the expense of banknotes"
See the link to "The Principle of Multiple Deposit Creation" pdf document towards bottom of page.
mhhe.com
«Cópia arquivada». Consultado em 10 de julho de 2009. Arquivado do original em 5 de dezembro de 2007
newyorkfed.org
An explanation of how it works from the New York Regional Reserve Bank of the US Federal Reserve system. Scroll down to the "Reserve Requirements and Money Creation" section. Here is what it says:
"Reserve requirements affect the potential of the banking system to create transaction deposits. If the reserve requirement is 10%, for example, a bank that receives a $100 deposit may lend out $90 of that deposit. If the borrower then writes a check to someone who deposits the $90, the bank receiving that deposit can lend out $81. As the process continues, the banking system can expand the initial deposit of $100 into a maximum of $1,000 of money ($100+$90+81+$72.90+...=$1,000). In contrast, with a 20% reserve requirement, the banking system would be able to expand the initial $100 deposit into a maximum of $500 ($100+$80+$64+$51.20+...=$500). Thus, higher reserve requirements should result in reduced money creation and, in turn, in reduced economic activity."
