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3 reasons for curve downward slope
Wealth effect ; interest rate effect ; exchange rate effect — all work simultaneously to increase the quantity of goods and services demanded when price level falls and vice versa
Wealth effect
Lower price level raises real value of household money holdings
Interest rate effect
Lower price level reduces amount of money people want to hold As ppl try lend out excess, interest rate fall. Stimulates investment spending thus increase quant of good demanded
The 3 effects are not of equal importance
Wealth effect least important (money holding only small part of household wealth). Exchange rate effect not large for US (but could be for smaller country bc export/import larger fraction of GDP). most important for US is interest rate effect
Theory of liquidity preference
Keynes’s theory that interest rate adjusts to bring money supply and money demand into balance
When borrowers and lenders expect prices to rise over term of the loan they agree to a nominal interest rate that exceeds the real interest rate by the expected rate of inflation
The higher nominal interest rate compensates for the expectation that the loan will be repaid in less valuable dollars
Why is there always some demand for money
People choose to hold money instead of other assets that offer higher rates of return bc they can use to buy goods and services
Interest rate
Represents opp cost of holding money (you lose interest you could have earned if you hold wealth as cash rather than interst bearing bond or bank deposit)
Interest rate effect and why downward slope aggregate demand curve
Higher price level raises money demanded which increases interest rate which decreases Q of goods and services demanded. Hence when price level rises, quantity of goods and services demanded decrease
Whenever the q of goods and services demanded changes for any price level, the aggregate demand curve shifts
Monetary policy shifts agg demand curve
When fed increases money supply (such as through injections), it lowers the interest rate and increase the Q of goods and services demanded for any price level, shifting the agg demand curve to the right. Vice versa
The role of interest rate targets in fed policy
Federal funds rate
(interest rate that banks charge one another for short term loans), price banks pay to aborrow money from each other. reevaluated every 6 weeks at meeting of the federal open market committee
Why does fed target federal funds rate
Money supply hard to measure precisely, and money demand fluctuates. Federal fund rate allows to accommodate day to day shift in money demand by adjusting money supply accordingly
If banks are borrowing too much and FFR too high
Fed adds money
Changes in monetary policy aimed at expanding aggregate demand can be desc either as increasing money supply or reducing int rate
Vice versa
Liquidity trap
Interest rates are very low, close to 0%. People dont want to spend or invest even if rates go lower. Everyone wants to hold cash (liquidity) bc uncertain about future. So traditional monetary policy STOPS working.
Forward guidance
Central bank commit itself to keeping interest rates low for extended period. Businesses and consumers feel confident borrowing and spending now because they know money will stay cheap in the future.
Quantitative easing
When interest rates are near zero, the Fed buys long-term financial assets, like government bonds or mortgage-backed securities. This increases money supply and decrease long term interest rate. Encourage borrow and spend
Fiscal policy
Setting of levels of gov spending and taxation by gov policymakers
When policymakers change the money supply or level of taxes, they shift agg demand curve indirectly by influencing spending decisions of firms or households.
BUT when gov alters their own purchase it shifts agg demand curve directly
Lets say US department of defense place 20 billion dollar order for fighter planes
Size of shift in aggregate demand may DIFFER from change in gov purchase (so not 20 billion) bc multiplier effect and crowding out effect
Multiplier effect
Additional shifts in agg demand that result when expansionary fiscal policy inc income and thereby consumer spending (positive feedback loop)
Investment accelerator
Positive influence of demand on investment
Marginal propensity to consume
Fraction of extra income that household consumes rather than saves
Multiplier = 1 / (1 - MPC)
Multiplier effect applies to any event that alters spending on any component of gdp
Consumption investment gov purchase or NX
Crowding out effect
Offset in agg demand that results when expansionary fiscal policy raises interest rate and thereby reduce investment spending
Changes in taxes can also affect fiscal policy
When gov cuts personal income tax, increases additional income and can spend on consumer goods. TAX CUT Agg demand curve shift right. But also affected by multiplier and crowd out effects
People perception about whether the tax change is perm or temporary
Determines size of shift in ag demand . if permanent, increase spending by large amount.
Active stabilization policy
FOMC - to prevent adverse effect of raising taxes, can increase money supply. Reduce interest rate, stimulate investment spending and expand aggregate demand. If monetary policy is set appropriately, combined changes in monetary and fiscal policy could leave the aggregate demand for goods and services unaffected.
Employment act of 1946
hold gov accountable for short run macroeconomic performance
Two implications of employment act
1-gov should avoid being a cause of econ fluctuation. 2- gov as much as poss respond to changes in private economy to stabilize aggregate demand
Keynes
Aggregate demand fluctuates bc of largely irrational waves of pessimism and optimism. Pessimism? Household reduce consumption spending and firms reduce investment spending. Result = reduced agg demand, lower production higher unemployment
Argument against active stabilization
Policies operate with long lag. Most believe at least six months for changes in monetary policy to have much effect on output and employment. Fiscal policy also works with lag to implement - so can cause more destabilizing
Automatic stabilizers
Changes in fiscal policy that stimulate aggregate demand when the economy goes into a recession but occur w/o policymakers having to take any deliberate action
Automatic stabilizer = tax system
When recession, gov tax collection decline automatically bc almost all tax closely tied to econ activity. Gov tax revenue falls… automatic tax cut stimulates aggregate demand and reduces magnitude of economic fluctuation
Some government spending also acts as automatic stabilizer
More people eligible for unemployment insurance benefits, welfare, income support