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Money and the Banking System
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The Circular Flow Diagram Again
Injection Leakage Injection Injection Leakage Leakage
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Why are Banks So Heavily Regulated
Banks regulated for two main reasons Concern for safety of depositors Allows better control of the money supply Run on a bank Many depositors withdraw cash from their accounts all at once Bank runs and failures uncommon in U.S., but they happen.
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Bank Failures in the United States, 1915–1945
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Bank Failures in the United States, 1945–2013
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The Nature of Money Barter Money
System of exchange in which people trade one good for another Requires the double coincidence of wants Money Money is used as an intermediate step Eliminates the double coincidence of wants Makes the whole exchange process easier and makes the economy more productive
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The Nature of Money Three functions of money Commodity money
Medium of exchange - standard object used in exchanging goods and services Unit of account - standard unit for quoting prices Store of value - store wealth from one point in time to another Commodity money An object in use as a medium of exchange that also has a substantial value in alternative uses
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The Nature of Money Fiat money (Paper money)
Decreed as money by government Little value as commodity Maintains value as a medium of exchange as long as people have faith that the issuer will stand behind the pieces of printed paper and limit their production
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How the Quantity of Money is Measured
Money supply M1 Narrow definition of money supply Coins and paper money in circulation Traveler’s checks Conventional checking accounts and other checkable deposit balances
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Figure 2 Two Definitions of the Money Supply, December 2014
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How the Quantity of Money is Measured
Money supply M2 Broadly defined money supply M1 Money market deposit accounts Money market mutual funds Savings accounts
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Figure 2 Two Definitions of the Money Supply, December 2014
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How the Quantity of Money is Measured
Near moneys Liquid assets that are close substitutes for money Liquidity refers to the ease with which it can be converted into cash What about credit cards? Will focus on M1 - coins, paper money, and checkable deposits
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Fractional reserve banking system
The Banking System How banking evolved From using gold as commodity money To goldsmiths who issued paper receipts backed by gold Then clever goldsmiths started lending out “gold” Fractional reserve banking system Bankers keep as reserves only a fraction of deposits
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The Banking System Features of fractional reserve banking
Bank profitability Banks are in business to earn profits Profit = Interest on loans – interest on deposits Bank discretion over money supply Loans create new money Banks decisions on how much to hold in reserves influences the supply of money Exposure to bank runs Keep prudent reserves and lend out money carefully
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The Banking System Bank regulation Deposit insurance
Designed to ensure depositors’ safety and to control the money supply Deposit insurance Guarantees that depositors will not lose money even if their bank goes bankrupt Federal Deposit Insurance Corporation/ FDIC Moral hazard problem If insured against consequences of risk people engage in riskier behavior
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The Banking System Reserve requirements
Minimum amount of reserves required by law Set as a percentage of deposits
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The Origins of the Money Supply
Bankers books Asset An item of value owned Liability Item of value owed; debts Balance sheet - accounting statement Left side: values of all assets Right side: values of all liabilities and net worth
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Table 1 Balance Sheet of Bank-a-Mythica, December 31, 2014
Reserve Requirement is 20% Net Worth = Assets - Liabilities
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Banks and Money Creation
Suppose someone deposits $100,000 into a bank. How does that lead to a multiple expansion of the money supply? Deposit creation Process by which a fractional reserve banking system turns $1 of bank reserves into several dollars of bank deposits Excess reserves Reserves held in excess of legal minimum
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Table 2 Changes in Bank-a-Mythica’s Balance Sheet, January 2, 2015
NOTE: we are looking at changes to the balance sheet, plus and minus The $100,000 deposit creates $80,000 of excess reserves What does Mythica do with their excess reserves?
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Table 4 Changes in Bank-a-Mythica’s Balance Sheet, January 2–6, 2015
Mythica uses excess reserves to make a new loan. What has happened to the money supply? Has increased from $100,000 (cash) to $100,000 (checking) + $80,000 (cash from loan) = $180,00
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Table 5 Changes in First National Bank’s Balance Sheet
The $80,000 will be deposited into another bank. And that bank will make a new loan: $64,000
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Table 6 Changes in Second National Bank’s Balance Sheet
Which ends up in another bank . . .
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Banks and Money Creation
Assumptions Each bank holds exactly 20% required reserves Each loan recipient re-deposits cash proceeds - next bank
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Figure 3 The Chain of Multiple Deposit Creation
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Banks and Money Creation
Each column forms a geometric progression Each entry is 80% of the previous entry $100,000 + $80,000 + $64,000 + $51, = $100,000 x ( ) = $100,000 x 1/(1 – 0.80) = $500,000 in new deposits
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Banks and Money Creation
In general If the required reserve ratio = m Money multiplier = 1/m Banking system can convert each $1 of reserves into $1/m in new money Money multiplier Ratio of newly created bank deposits to new reserves Change in money supply = (1/m) ˣ Change in excess reserves
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Banks and Money Creation
Be careful here! The money supply does not increase by $500,000! Deposits increase by $500,000 But the process started with a $100,000 cash deposit So money supply increases by $400,000 = (1/m) ˣ Change in excess reserves = (1/.2) x $80,000
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Banks and Money Creation
Multiple contractions of money supply Start with a withdrawal $100,000 Banks reserves will decrease by $100,000 Need $80,000 to meet reserve requirement
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Table 7 Changes in the Balance Sheet of Bank-a-Mythica
Where does Mythica get the $80,000?
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Table 7b Changes in the Balance Sheet of Bank-a-Mythica
Outstanding loans are paid off, and new loans not granted But where did the borrowers get the money to pay off the loan?
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Table 8 Changes in the Balance Sheet of First National Bank
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Banks and Money Creation
Multiple contractions of money supply Entire process is just the reverse from before Deposits down by $500,000 Loans down by $400,000 Reserves down by $100,000 Money supply down by $400,000
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Money-Creation Formula is Oversimplified
Our money multiplier accurate under two circumstances Every borrower receiving cash must redeposit cash to another bank rather than hold it Every bank must hold reserves no larger than the legal minimum 1. If individuals and business firms hold more cash Fewer dollars of cash available for use as reserves Limits the multiple expansion of bank deposits Smaller money supply
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x x x x Individuals and Business Firms Hold More Cash
What if only $70,000 is deposited? x x x x
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Money-Creation Formula is Oversimplified
2. If banks hold excess reserves Limited multiple expansion of bank deposits Smaller supply of money
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Table 2&3 Changes in Bank-a-Mythica’s Balance Sheet, January 2, 2015
What if bank only lends out $60,000? $40,0000 $60,000 $40,0000 +$20,0000
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Money-Creation Formula is Oversimplified
Banks holding on to excess reserves has been key over the last 7-8 years U.S. after September 2008 Collapse of Lehman Brothers set off a financial panic Banks clung to reserves Excess reserves, U.S. $2 billion (just before Lehman) to over $2.8 trillion (September 2015)
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Figure 4 Excess Reserves in the U.S. Banking System, 2008–2014
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Money-Creation Formula is Oversimplified
August 2008 – September 2014 Total bank reserves rose 260 fold M1 money supply roughly doubled
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The Need for Monetary Policy
Government regulates money supply to maintain stability During a recession Banks prone to reduce money supply Increase excess reserves Decrease lending to less creditworthy applicants Without government intervention contraction in money supply would aggravate recession Federal Reserves during the Great Depression and the recent financial crisis and Great Recession
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The Need for Monetary Policy
During an economic boom Banks expand money supply Undesirable momentum to economy Without government intervention rapid money growth could lead to inflation
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