Презентация Unemployment rate онлайн
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- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:46 слайдов
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:1.23 MB
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Слайды и текст к этой презентации:
№2 слайд
Содержание слайда: Let’s review our voyage to date:
We have analyzed:
Measuring economic activity
Aggregate production functions and distribution
Classical AS and AD (flexible w and p)
Financial macro (including money)
Open-economy macro
We now move on to
Business cycles, Keynesian economics, and the IS-LM model
№3 слайд
Содержание слайда: What picture do you have in mind when you think of business cycles?
What picture do you have in mind when you think of business cycles?
“Note that the pattern of cycles is irregular. No two business cycles are quite the same. No exact formula, such as might apply to the revolutions of the planets or of a pendulum, can be used to predict the duration and timing of business cycles. Rather, in their irregularities, business cycles more closely resemble the fluctuations of the weather.” (Paul Samuelson)
№4 слайд
Содержание слайда: Understanding business cycles
Major elements of cycles
short-period (1-3 yr) erratic fluctuations in output
pro-cyclical movements of employment, profits, prices
counter-cyclical movements in unemployment
appearance of “involuntary” unemployment in recessions
Historical trends
lower volatility of output, inflation over time (until 2008)
movement from stable prices to rising prices since WW II
№12 слайд
Содержание слайда: Major approaches to business cycles
Classical: market clearing: supply-side cycles with vertical AS curve:
Real business cycles: major active classical species today
Keynesian and offshoots: non-market clearing with non-vertical AS
Essential to have non-classical AS
Fixed or sticky p and w
AD shifts affect output and employment
Underlying theory incompletely understook – active area of research
Basic models in Keynesian approach
“Keynesian cross” (Econ 116)
AS-AD (Econ 116)
IS-LM (Econ 122)
Mankiw’s dynamic model (later)
Open-economy in short run: Mundell-Fleming (later in course)
№15 слайд
Содержание слайда: IS-LM model
The major tool for showing the impact of monetary and fiscal polices, along with the effect of various shocks, in a short-run Keynesian situation.
Key assumptions
Fixed prices (P=1)
Unemployed resources (Y < potential Y = Mankiw’s natural Y)
Closed economy (not essential and will be considered later)
№17 слайд
Содержание слайда: Keynes on Why macroeconomics is difficult
or
Why the models are so confusing!
Professor Planck, of Berlin, the famous originator of the Quantum Theory, once remarked to me that in early life he had thought of studying economics, but had found it too difficult! Professor Planck could easily master the whole corpus of mathematical economics in a few days. But the amalgam of logic and intuition and the wide knowledge of facts, most of which are not precise, which is required for economic interpretation in its highest form is, quite truly, overwhelmingly difficult.
(“Biography of Marshall,” Economic Journal, 1924)
№19 слайд
Содержание слайда: Where are we?
We are now attempting to understand the basic features of business cycles.
Aggregate supply (AS) in this model is real simple: a horizontal AS curve with p=1.
AD relies on the IS-LM model, which is a very simple two-market model of the determinants of AD.
The two markets are
- goods (IS)
- financial (LM)
№20 слайд
Содержание слайда: IS curve (expenditures)
Basic idea: describes equilibrium in goods market
Finds Y where planned I = planned S or planned expenditure = planned output
Basic set of equations:
Y = C + I + G
C = a + b(Y-T)
T = T0 + τ Y [note assume income tax, τ = marginal tax rate]
I = I0 –dr [note i = r because fixed P]
G = G0
№21 слайд
Содержание слайда: which gives the IS curve:
which gives the IS curve:
Y = a - bT0 + G0 + I0 - dr
1 - b(1- τ)
Y = μ [A0 - dr]
where
A0 = autonomous spending = a - bT0 + G0 + I0
μ = multiplier = 1/[(1 - b(1- τ)]
or in terms of solving for the interest rate:
r = (A0 - Y/μ ) / d
which we graph as the IS curve.
№22 слайд
Содержание слайда: LM curve (financial markets)
The LM curve represents equilibrium in financial markets, or where the supply and demand for money are equilibrated.
Ms determined by the central bank
Ms = M0
Standard interest-elastic demand for money:*
Md = L(i, Y) = kY- hi
Equilibrium in the money market is Md = Ms
This leads to LM curve:
i = ( kY - M0 )/h
Not the best way to understand financial markets;
will consider alternative approach later.
* Note that interest rate is nominal rate here to reflect the difference between the interest rate on bonds and that on money.
№23 слайд
Содержание слайда: Summary of IS-LM
Y ≡ C + I + G
C = a + b(Y-T)
T = T0 + τY
I = I0 – dr
G = G0
Ms = M0
Md = L(i, Y) = kY- hi = kY- hr [r = i because zero inflation]
All this yields
hμ dμ
Y* = ―――――― A0 + ――――― M0
dμk + h dμk + h
where
A0 = autonomous spending = a - bT0 + G0 + I0
μ = expenditure multiplier at constant r = 1/[(1 - b(1- τ)]
№24 слайд
Содержание слайда: Overall Macroeconomic Equilibrium
We now are looking for equilibrium of both markets. That is, when both goods market and money market are in equilibrium.
Closed economy and zero inflation (so i=r)
This is the solution or intersection of IS and LM.
hμ dμ
Y* = ―――――― A0 + ――――― M0
dμk + h dμk + h
Impact of fiscal and monetary policy function of the different parameters. Easiest to understand using the IS-LM diagram.
№26 слайд
Содержание слайда: SOME BASICS OF THE IS-LM MODEL
Have two major kinds of shocks in business cycles:
IS: investment, consumption, foreign trade, …
LM: financial markets, monetary policy, exchange rates,…
Because of monetary reaction, expenditure multiplier is almost surely less than standard Keynesian multiplier due to crowding out.
Proof: IS-LM multiplier = μ/[dμk/h + 1] < μ = simplest multiplier
Can usually diagnose shock by the relative movements of output and interest rates (compare Vietnam War and 1979-82 on next slide)
№40 слайд
Содержание слайда: Can you see why macroeconomists emphasize the importance of fiscal policy in the current environment?
Can you see why macroeconomists emphasize the importance of fiscal policy in the current environment?
“Our policy approach started with a major commitment to fiscal stimulus. Economists in recent years have become skeptical about discretionary fiscal policy and have regarded monetary policy as a better tool for short-term stabilization. Our judgment, however, was that in a liquidity trap-type scenario of zero interest rates, a dysfunctional financial system, and expectations of protracted contraction, the results of monetary policy were highly uncertain whereas fiscal policy was likely to be potent.”
Lawrence Summers, July 19, 2009
№41 слайд
Содержание слайда: Case 3. Monetarism
The monetarist regime: "Only money matters for output determination.“ (Milton Friedman).
We can go back to quantity theory of money and prices:
PY = VM
In monetarism view, velocity is constant . This would lead to a vertical LM curve:
Md = kY – 0i
Hence, equilibrating supply and demand for M yields:
Y =Ms/k
№43 слайд
Содержание слайда: Important historical cases
Case 4. Changing the fiscal-monetary mix to stimulate or depress investment
A depressing example of tight money and loose fiscal
New Fed chairman Volcker moved to tighten money and wring inflation out of economy (1979 on)
New President Reagan launched supply-side tax policies, military buildup, leading to high deficits (1981 on)
How did this affect fiscal-monetary mix
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