7. MP/FP/EP and Philips curve Flashcards
What are demand driven economic fluctuations?
Contraction in AD:
- Pessimism, stock market bust, drop in exports
- Demand driven contraction - output falls, price level falls
Over time, the SRAS curve shifts right, output reverts to natural rate as price levels adjust downwards
Shown graphically pretty simply:
- actual prices drop below expected levels
- Over time, as expected price level adjusts, SRAS curve shifts right and economy reaches new point where new AD curve crosses the LRAS
- Output returns to natural rate Y1 and price level falls to P3
- Note with demand driven contraction we expect prices to fall = deflationary
uWhat are supply driven fluctuations
Contraction in AS:
- INcrease in prodcution costs, increase price expectations
- AS driven contraction - output falls, price levels increase
-Stagflation - inflation rate high, economic growth rate slows and unemployment remains high
With time, SRAS shifts back right, output reverts to natural rate as price level falls
Graphically:
- Events increase costs, SRAS curve shifts left from AS1 to AS2. Economy moves left up the AD curve resulting in stagflation - output falls, price levels rise
What are examples of AD/AS driven recession/expansion
Great depression:
- Real GDP fell 27%
- Unemployment rose from 3% to 25%
- Prices fell 22%
- Money supply fell 28% - low AD
Expansion - early 1940 wartime expenditure
- Unemployment fell from 17% to 1%
- Prices rose 20%
Also occured post pandemic
AS contraction - oil crisis in 70s
AS expansion - new technology driving expansion in 90s
What was the impact of the pandemic on fluctuation
Market shut down completely - AS shock, AD drifted to far right due to policies
- Inflation and shifted AD left, CB raised interest rates
Graphically:
- Shifts left in SRAS - lead to staglation
- Over time, output reverts to natural rate, prices drop back down
- To counter policy makers elect to shift AD curve right so output returns quickly to natural state
- Causes higher inflation
What is the effect of monetary policy
CHange in money supply shifts AD curve
- Increase in money lowers interest, expansionary
- Decrease raises interest, contractive (AD left)
Effect shown on page 28
What are tools used for monetary policy
Adjusting refinancing rate
Conducting Open Market Operations to change interest rates
- To ensure 2& CB bond traders supply enough money to ensure met
- Changing money supply and hcnaging interest rate amounts to same outcome
What is the effect of fiscal policy?
Changes in G or taxation
- DIrectly shifts AD
A £1 increase in spending may be worth more than £1 dependingon:
Multiplier effect - amplifies effect on AD
Crowding out - diminishes effect on AD
WHat is the multiplier effect?
Consumers respond to an injection of money, firms increase investment and consumers spend more
- Leads to a further shift to the right in AD, which gradually diminishes
Spending multiplier depends on:
MPC - marginal propensity to consume
- Larger MPC, larger multiplier
- If income increases for people likely to spend it, multiplier higher
As a result of multiplier effect £1 increase in spending leads to a greater than £1 increase in AD
What are some of the calculus for multiplier
MPW = MPS + MPT + MPI
MPW = 1-MPC
Multiplier = 1/MPW
OR
= 1/1-MPC
What is the effect of crowding out
An increase in G causes AD to shift right
- Increase income increases demand for money
- Increased interest rates and so reduction in investment spending
As a result AD curve shifts back towards the left
- Crowding out happens in long run if governments continuously run deficit
Effect on page 28
Since the government expenditure increases, money supply increases raising demand and raising interest rates
What is active stabilisation policy? What is the Keynesian view?
Both MP and FP used to stabilise econom yin face of shocks
- Objective to ensure YFE and stable inflation
Keynesian:
- Key role of AD explaining fluctuations - state should stimulate AD to maintain production at full employment level to avoid unemployment
What is the argument against active stabilisation policy?
-AD hard to control - long and variable lags
- Unreliable forecasts - leads to mistakes - overheating, bubbles, runaway inflation
- Corruption -> waste
- Better to leave economy alone and let market mechanisms deal with short run fluctuations
What was the effect of the 2008 recession
- Large contractionary shift in AD
-Real GDP fell sharp - 4% between Q4 2007 and Q2 2009 - Employment fell sharply - unemployment rose 4.4% may 2007 to 10% october 2009
What were the 2008 policy actions
CB cut targets for repo rate - espcailly to about zero in late 2008
- Bought bonds, mortgage backed securities and private loans in market open market operations, providing banks with additional funds
October 2008 - Congress appropriated $700bn in the US
- For treasury to rescue financial system, stem financial crisi on Wall St, make loans easier to obtain and inject equity into banks
- UK and US temporarily part owner of some banks
Jan 2009 - Obamna increased government spending - $787bn stimulus bill in febuary
- Arguably worked but we dont know impact if didnt happen
What are automatic stabilisers?
Automatic chnage sin spending that stimulate AD when economy goes into recession
Operates through taxes and transfers
In recession less tax collected, reduction in AD. More unemployment benefits paid out in recession - raises AD
(opposite happens during a boom)
However, not sufficiently strong to prevent business cycles completely
- size depends on public sector size relative to GDP
- Without them, output and employment much more volatile
Why does the classical dichotomy break down in AD/AS model in the short run? how does it differ in long run
In long run - inflation depends only on growth in money supply
- Unemployment tends to natural rate - depends on NMW, unions, efficiency wages, search, etc.
Short run:
- Classical dichotomy breaks down
- Inflation and output related - expansionary policy increases output and inflation
What does the phillips curve show? How does it differ for low/high levels of AD? What happens as you move down it
The trade off between inflation and unemployment in the short run
- Negative sloping curve correlation between the two
High AD:
- high output and prices - low unemployment and high inflation
Low AD;
- Low output and price level - high unemployment and low ifnlation
Moving down:
If AD shifts right, lower AD curve would be further along curve whilst higher AD curve would be closer to the y axis
How does AD and AS respond to philips curve? What does the phillips curve look like in the long run?
AS curve slopes upward due to actual prices differing from expected prices
- Thus philips curve slopes downward only when actual inflation is different from expected inflation
When actual = expected inflation, philips curve will be verticalq
Long run:
- Unemploymen ttends towards natural rate
- Doesnt depend on money growth and inflation in the long run (classical dichotomy)
What is the effect of MP on inflation? (GRAPHICALLY)
Genereates a surprise/unexpected inflation - if not AS curve would be vertical and be no change in Y/unemployment
Monetary expansion creates price increase, raising output
- In long run, people come to expect higher inflation to persist and expectations catch up with expectation - causes a move up the long run phillips curve (illustrated on 28)
Higher expected rate means higher short run trade off between inflation and unemployment is at its natural rate
- If then MP expansionary, economy moves up in the short run
- Expected inflation still low at point B, but actual inflation high
Unemployment below natural rate - in long run, expected inflation rises, economy moves to point C
- Expected inflation and actual inflation both high; unemployment back to natural rate
What were Friedmand and Phelps’ theory?
Unemployment rate = natural rate of unemployment - a(Actual inflation - expected inflation)
(a is a parameter measuring how much unemployment responds to unexpected inflation)
- Similar to SRAS equation
If actual > expected, unemployment lower than natural rate
What causes shifts in the philips curve
Changes in expected inflation
e.g. oil price shocks made inflationary pressures intolerable, policy focus on fighting inflation in early 80s by contractionary MP
- AD contracts, reduces inflation and moves down PC - also leads to lower unemployment which is costly
However ver time, short run philips curve shifts left, returning unemployment to its natural rate but now with a lower rate of inflation: graphed again on 28
Explanation:
- Contractionary monetary policy reduces inflation, economy moves along SRPC from A to B
- Over time expectations fall, so short run curve shifts downwards - when C is reached, unemployment at natural rate
What is the sacrifice ratio
- % of annual output lost in process of reducing inflation by 1%
- Typically about 3 to 5%
For each $ inflation reduced, 3 to 5% of annual output sacrificed in transition
- In early 1980s inflation over 20% - to reduce to 5% lost 40% annual output
WHat are rational expectations
- People optimally use all information when forecasting future - including policy information
If people belief CB will fight inflation, may lower inflation expectations, disinflation may cost less
How is it possible for costless disinflation
Rational expectation implies a much smaller sacrifice ratio (maybe even 0)
Government must credibly commit to policy of low inflation so:
- People lower expectations
- When actual inflation decreases sharply, so does expected inflation
- We can stay of the long run philips curve
