Ch 10 The Macro Model

Transcript Ch 10 The Macro Model

The Macro Model

National Income Chapter 10

Apple CEO Steve Jobs

Graphing the Macro Model

 The vertical axis of the measures the Price Level, rather than Price in the Micro Model  The horizontal axis of the measures Real GDP, rather than quantity of micro model  Price Level = PL  Real GDP = RGDP

Long Run Aggregate Supply

   The Long Run Aggregate Supply curve represents an economy where all inputs: land, labor and capital are used to their fullest efficiency The Long Run Aggregate Supply Curve = LRAS It is similar to the productions possibilities frontier on a production possibilities graph

Real GDP or National Income

 The LRAS represents the economy running at “ full employment ” or the maximum level of national income.

 The LRAS often uses Y to represent “ full employment ” RGDP or maximum National Income

Growth

 The LRAS may shift to the right indicating that there has been economic growth of real GDP  This is similar to the shift out in the production possibilities graph

Increases in the LRAS

 Growth created with the LRAS leads to increases in RGDP and decreases in price levels  This is a good situation for an economy when it can grow without price rises.

RGDP Contractions

 The LRAS may also shrink with a real GDP contraction  This is indicated by the LRAS shifting to the left  This type of shift is called a

supply shock

Decreases in the LRAS

 Decreases in the LRAS can leads to decreases in Real GDP and increases in Price Levels  This type of inflation is called

cost push inflation

What are the four components of Aggregate Demand?

 C = Consumption  I = Business Investment  G = Government Spending  NX= Net Exports = exports imports

Aggregate Demand

    The macro model has a downward sloping aggregate demand curve The Aggregate Demand = C+I+G+(NX) Aggregate Demand is abbreviated AD The place where the AD intersects the LRAS is the price level

Increases in Aggregate Demand

   Increases in Aggregate demand lead to increases in price levels, however with the LRAS there is no change in RGDP These increases are called

demand pull inflation

This type of inflation is common during period of economic expansions

Decreases in Aggregate Demand

 Decreases in Aggregate Demand lead to lower price levels, however real GDP does not change Real GDP  Decreases in aggregate demand commonly occurs during a contraction or recession

What happens to RGDP if price levels fall?

 If price levels fall the RGDP will rise

What happens to RGDP if price levels rise?

 If price levels rise the RGDP will fall

Why does the AD curve slope down?



Wealth Effect

-(also called Real Balance Effect) if price level rises, people ’ s purchasing power goes down and if price levels fall people ’ s purchasing power goes up

Why does the AD curve slope down?

Interest Rate Effect

- if prices rise the real value of money goes down, therefore the demand to borrow money increases, driving up interest rates. Conversely if prices fall, interest rates fall.

Why does the AD curve slope down?



Open Economy Effect

if price levels go up our net exports drop; if price levels goes down our net exports increase

What causes increases and decreases Aggregate Demand

   Changes in price levels lead to changes in real GDP There are a variety of

non price factors

which can shift the Aggregate Demand curve up and down.

Look at the following examples, and figure out whether they will increase or decrease AD

People begin buying more food, clothing, and cars

 Aggregate demand will rise

The federal government reduces military spending

 Aggregate demand will fall

Sales tax is eliminated in California

 Aggregate demand will rise

Foreign countries buy more US exports

 Aggregate demand will rise

The money supply decreases

 Aggregate demand will decrease

The US dollar becomes stronger compared to the Euro

 Aggregate demand will fall

The Federal Reserve Bank raises interest rates

 Aggregate demand will fall

A US company sells a jet to a foreign country

 Aggregate Demand will rise

A US company buys coffee beans from Guatemala

 Aggregate demand will fall

A drop in the value of the dollar

 Aggregate demand will increase

The Federal reserve restricts the money supply

 Aggregate demand falls

Interest rates fall

 Increase in aggregate demand

Europe and Japan suffers from a Depression

 Aggregate Demand falls

China grows rapidly, and buys high tech US products

 Aggregate Demand rises

Shifts in Long Run Aggregate Supply Curve

Which side are you on?

          Consumer spending increases AD New inventions boost solar energy AS Government cuts back on military budget AD Government raises the retirement age on workers AS Business investment increases AD

Which side are you on?

 Retraining of US workers make them more productive  AS  New shale oil is discovered in the Rockies  AS

Modern Macro Model with Short Run Aggregate Supply Curve

Short Run Aggregate Supply Curve

 The short run aggregate supply curve or (SRAS) can shift when there are temporary efficiencies in capital, labor, and land  For example, plants can run at more than a 100% capacity, when they run at night.

 Workers can work overtime, thus increasing the productivity of labor

Shifts in the short run Aggregate Supply

 Short run increases in the supply curve is the result of:  Labor working overtime  More efficient technologies are introduced  The costs of labor, land or capital falls

Decreases in the SRAS

 The SRAS can also decline if:  Natural disasters disrupt the flow of resources  Any increase in the price of the inputs of production: land, labor, and capital  Any fall in the productivity or efficiency of land,labor,and capital