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Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-1 The Money Supply Process and Banks I. The Role of Money in an Economy What is money? – medium of exchange – standard of value – store of value In the absence of money, barter emerges. Barter requires the double coincidence of wants, and is inefficient. Money and a monetary economy allow for efficient transactions. Players in the money supply process: – A Central Bank (the Fed) – Depository institutions (banks) – Depositors
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-2 II. A Simple Model of Banks in the Monetary System A bank is an institution that accepts deposits from individuals or firms and then invests the proceeds in securities or loans. A bank needs to hold only a fraction of deposits in reserves. This is what is meant by the fractional reserve system. Funds not held in reserves are available for investment. Investment in securities or loans expands the total money supply.
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-3 A. Multiple Deposit Expansion in the Simple Model Assumptions: 1. There is only one bank. 2. Banks hold only required reserves. 3. The public holds no currency. 4. The Fed starts the process by increasing reserves by $100. The reserve requirement is the percentage of deposits that is set aside for regulatory or liquidity purposes. Funds beyond the required reserves are excess reserves. They do not earn any return and are, therefore lent out. Excess reserves are calculated: The process where one deposit leads to many is multiple deposit expansion.
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-4 Insert Balance Sheet 1 B. Multiple Deposit Contraction in the Simple Model If the public chooses to increase currency balance sheet items decline in a process called multiple deposit contraction. C. Multiple Banks in the Simple Model The previous examples can be expanded to a milieu that contains many banks. Insert Balance Sheet 2, 3, 4.& 5 Insert 26.1
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-5 D. The Deposit Expansion Formula: A Simple Model Finding the equilibrium level of deposits requires finding the reserve multiplier: A change in the reserve level will result in a change in deposits of:
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-6 III. Extending the Simple Model The model can be expanded to include other depository categories. Currency (C) plus reserves (R) are referred to as the monetary base (B) or high powered money: B = C + R Suppose the public holds currency and two types of deposits, and banks hold excess reserves. The two types of deposits are checkable deposits (D c ) and time deposits (D t ): D = D c + D t
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-7 Each deposit has its own required reserve ratio. Therefore required reserves are: R r = r c D c + r t D t Lastly, add in the excess reserves (R e ): B = r c D c + r t D t + R e + C We can use this equation to derive the reserve multiplier for checking:
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-8 IV. Money Supply Determination Macroeconomists have long debated the relationship between the quantity of money in an economy and the behavior of the economy. Macroeconomists believe that an increase in the money supply will increase output and result in inflation. It is therefore of importance to determine the quantity of money. A. Definition of the Money Supply There has long been disagreement as to what instruments should be included in the definition of money supply. We will use the two most common which are used by the Federal Reserve. – M1 includes currency, travelers checks, demand deposits, and other checkable deposits: M1 = D c + C – M2 reflects a broader definition of money. It consists of M1 plus small time deposits, savings deposits, money market accounts, money market mutual fund balances, and overnight repurchase agreements: M2 = M1 + D t
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin 26-9 Insert 26.2, 26.3, & 26.4 B. The Money Multiplier How does a change in the monetary base affect money supply? Assume that currency, time deposits, and excess reserves all grow proportionately with checkable deposits. Then, every time checkable deposits change, the other categories will change proportionally. The proportions are given by: c: currency relative to checkable deposits t: time deposits relative to checkable deposits e: excess reserves relative to checkable deposits
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin Substitution into the formula for the monetary base: Solve for D c : Recall that: Substituting, we get:
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin Therefore, the M1 money multiplier is: Similarly, the M2 money multiplier is: From these money multipliers it can be shown that: 1. an increase in either required reserve ratio will decrease M1 & M2 2. an increase in the currency to checkable deposits ratio will decrease M1 & M2 3. an increase in excess reserves will decrease M1 & M2 4. an increase in the time deposits ratio will decrease M1 but will increase M2 If the Fed knows the money multiplier, then it knows the effect of a change in the base on the money supply.
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.McGraw-Hill/Irwin IV. Summary We explored both the role that money plays in the economy and that banks play in determining the total money supply. We have shown that the money supply is determined by: – bank behavior – depositor decisions – central bank monetary base Decisions as to reserve levels and cash holdings have impacts on the money supply through the multiple deposit creation process; households change the total money supply by their portfolio decisions. The Federal Reserve determines the monetary base which is central to the determination of the money supply.
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