Unit V and VI

From Short Run to Long Run

·         AS curve doesn't shift in response to changes in the AD curve in the short run

·         i.e.--Nominal wages do not respond to price-level changes

o    Workers may not realize impact of the changes or may be under contract

·         Long Run--Period in which nominal wages are fully responsive to changes in price level

-When changes occur in the short run, they result in either increased or decreased producer profits--not changes in wages paid
-Nominal--What I'm pa id
-Real--What the real value is

·         In the long run, increases in AD result in a higher price level, as in the short run, but as workers demand more money, the AS curve shifts left to equate production at the original output level, but now at a higher price

·         In the ling run, the AS curve is vertical at the Natural Rate of Unemployment (NRU), or full employment level (FE) level of output. Everyone who wants a job has one and no one is enticed into or out of the market

-Demand Pull Inflation will result when an increase in demand shifts the AD curve to the right, temporarily increasing output while raising prices.

-Cost-Push inflation results when an increase in input costs that shifts the AS curve to the left. In this case, the price level increases is not in response to the increase in AD, but instead the cause of price level increasing.

The Phillip's Curve

·         Inverse relationship with unemployment and inflation

·         It represents the relationship between unemployment and inflation so that the tradeoff between inflation and unemployment occurs over the Short Run. Each point on the Phillip's Curve corresponds to a different level of output.

·         LRPC

o    Occurs at the natural rate of unemployment (NRU)

o    It is represented by a vertical line

o    No tradeoff between unemployment and inflation in the long run

1.      The Economy produces at the full employment output level

2.      The nominal wages of workers fully incorporate any changes in price level as wages adjust to inflation over the long run

3.      LRPC only shift if the LRAS curve shift (same determinants)

LRPC Curve

·         Increases in Unemployment will shift LRPC --->

·         Decreases in Unemployment will shift LRPC <---

Increases in AD = Up/Left movement along the SRPC
Decrease in AD = Down/Right along SRPC

 

Natural Rate of Unemployment is equal to

·         Frictional

·         Structural

·         Seasonal

The Natural Rates & Fuel worker benefits create a lower NRU

·         Extremely high unemployment if employers were required to provide health care

Supply Shock--A rapid and significant increase in resource costs which causes the SRAS curve to shift

Misery Index Practice Problem
Assume that major political events stop the delivery for oil tot he country, shifting the SRAS curve on the aggregate model. On the Phillips Graph, show how the SRAS shift would affect the SRPC. Use 4% as the original LRPC:

·         Unemployment Rate:

o    Last Year 3%, This Year 5%

·         Inflation Rate:

o    Last Year: 8%, This Year 3%

 

 

 

Misery Index

·         A combination of inflation & unemployment in any given year--single digit misery is good

·         If the inflation rate persists and the expected rate of inflation rises, then the entire SRPC moves upward, so when that happens, stagflation exists

·         If inflation expectations drop, then the SRPC moves downwards

Stagflation--Occurs when you have high unemployment and high inflation occurring at the same time

Disinflation--When inflation decreases over time

·         Nominal wages increases

·         Business profits fall as prices are rising, firms reduce employment thus unemployment decreases.

Laffer Curve
As tax rates increase from 0, tax revenues increase from 0 to some max level and then decline. The higher tax rate you set, the less money you will collect. Laffer Curve is controversial and debatable.

 

Criticisms:

1.      Where the economy is located on the curve is difficult to determine

2.      Tax cuts also increase demand which can fuel inflation

3.      Empirical evidence suggest that the impact of tax rates on incentives to work, save, and invest are small (Basically no incentive)

Supply-Side economics or Reaganomics
They support policies that promote GDP growth by arguing that high marginal tax rates along with the current system of transfer payments (unemployment, social security, etc.) provide disincentives to work, interest, innovate and undertake entrepreneurial ventures

·         Belief that the AS curve will determine levels of inflation, unemployment, and economic growth.

·         Reaganomics--> Triple-Down Effect

o    Rich-->Poor

Marginal Tax Rate
Amount paid or the last dollar earned or on each additional dollar earned. Supply side economist believe of there is a reduction in the marginal tax rates, more people would be inclined to work longer, thus foregoing leisure time for extra income.

The Phillips Curve

LRPC:
Because the LRPC exists at the natural rate of unemployment, structural changes in the economy that affect unemployment will also cause the LRPC to shift.

Relating Phillips Curve to AS/AD:

· Changes in the AS/AD model can also be seen in the Phillips Curves

· An easy way to understand how changes in the AS/AD model affect the Phillips Curve is to think of the two sets of graphs as mirror images.

*The 2 models are not equivalent. The AS/AD model is static, but the Phillips Curve includes change over time. Whereas AS/AD shows one time changes in the price-level as inflation or deflation, The Phillips curve illustrates continuous change in the price-level as either increased inflation or disinflation

Summary of the Phillips Curve:

• There is a short-run trade off between u% & π%. This is referred to as a short-run Phillips Curve (SRPC)

• In the long-run, no trade-off exists between u% & π%.This is referred to as the long-run Phillips Curve (LRPC)

• The LRPC exists at the natural rate of unemployment (u_n).

–     u_n ↑ .: LRPC à

–     u_n ↓ .: LRPC ß

• ΔC, ΔI_G, ΔG, and/or ΔX_N = Δ AD = Δ along SRPC

–     AD à .: GDP_R↑ & PL↑ .: u%↓ & π%↑ .: up/left along SRPC

–     AD ß .: GDP_R↓ & PL↓ .: u%↑ & π%↓ .: down/right along SRPC

• Δ Inflationary Expectations, Δ Input Prices, Δ Productivity, Δ Business Taxes and/or ΔRegulation = Δ SRAS = Δ SRPC

–     SRAS à .: GDP_R↑ & PL↓ .: u%↓ & π%↓ .: SRPC <--

–     SRAS ß .: GDP_R↓ & PL ↑ .: u%↑ & π%↑.: SRPC -->

Economic Growth and Productivity
Conditions for Growth:

• Rule of Law

• Sound Legal and Economic Institutions

• Economic Freedom

• Respect for Private Property

• Political& Economic Stability

–     Low Inflationary Expectations

• Willingness to sacrifice current consumption in order to grow

         Trade

• Saving

         Physical Capital:

   •Tools, machinery, factories, infrastructure

   •Physical Capital is the product of Investment.

   •Investment is sensitive to interest rates and expected rates of return.

   •It takes capital to make capital.

• Capital must be maintained.

         Technology and Productivity:

   •Research and development, innovation and invention yield increases in available technology.

   •More technology in the hands of workers increases productivity.

   •Productivity is output per worker.

• More Productivity = Economic Growth.

Human Capital:

• People are a country’s most important resource. Therefore human capital must be developed.

• Education

• Economic Freedom

• The right to acquire private property

• Incentives

• Clean Water

• Stable Food Supply

• Access to technology

Hindrance to Growth:

           •Economic and Political Instability

           –High inflationary expectations

           •Absence of the rule of law

           •Diminished Private Property Rights

           •Negative Incentives

           –The welfare state

           •Lack of Savings

           •Excess current consumption

           •Failure to maintain existing capital

           •Crowding Out of Investment

           –Government deficits & debt increasing long term interest rates!

           •Increased income inequality à Populist policies

•         Restrictions on Free International Trade