*Aggregate Demand*
Shifts in aggregate demand:there are two parts to a shift in ad
- a change in c, Ig, and/or Xn
- a multiplier effect that produces a greater change than the original
change in the 4 components
- increase=shifts to the right
- decrease=shift to the left
Determinants of AD:
Consumption
- household spending is affect by:
- consumer wealth
. More wealth=
more spending (AD shifts ->)
. Less wealth=
less spending (AD shifts <-)
- consumer expectations
. Positive
expectations = more spending (AD ->)
. Negative
expectation = less spending (AD <-)
- household indebtedness
. Less debt = more
spending
. More debt = less
spending
- taxes
. Less taxes =
more spending
. More taxes =
less spending
Gross private investment
• investment spending is a sensitive to:
- the real interest rate
. Lower real
interest rate = more investment (AD->)
. Higher real
interest rate = less investment (AD<-)
- expected returns
. Higher expected
returns = more investment
. Lower expected
returns = less investment
. Especial returns
are influenced by
- expectation of future profitability
- technology
- degree of excess capacity (Existjng stock of capital)
Govt spending
• more govt spending (AD->)
• less govt spending (AD<-)
Net exports
• nets exports are sensitive to:
-exchange rate (international value of $)
. Strong $ = more imports and fewer
exports (AD<-)
. Weak $ = fewer imports and more
exports (AD->)
- relative income
. Strong foreign Economies =
more exports
. Week foreign economies =
less exports
*Aggregate Supply*
-Long Run Aggregate Supply (LRAS) - the period of time where input prices are completely flexible and adjust to changes in the price level.
-the level of real GDP supplied is independent of price level.
-It marks the level of full employment in the economy. (FE, Yf, Y' = full employment)
-Analogous to PPC
-Since input prices are flexible in long run, changes in price level do not change firms real profits and therefore don't change firms level of output.
-LRAS is vertical at the economy's level of full employment.
-Short Run Aggregate Supply (SRAS) - Period of time where input prices are sticky and don't adjust to changes in the price level
-the level o real GDP supplied is directly related to the price level.
-because input prices are sticky in the short run, the SRAS is upward slopping.
-an increase in SRAS is seen as a shit to the right ---> and decrease to the left <---
-the key to understanding shifts in SRAS is per unit cost production
-per unit cost production = total input cost
Determinants of SRAS: (affect unit production cost)
- Input Prices
- Productivity
- Legal - Institutional Environment: taxes and subsidies
- Taxes (money to government) on business increase per unit production cost, shits SRAS <----
- Subsidies (money from government) to business reduce per unit production cost, shifts SRAS ---->
Domestic Resource Prices:
-wages (75% of all business costs)
-cost of capital
-raw materials (commodity prices)
Foreign Resource Prices:
-Strong money: lower foreign resource prices
-Weak money: higher foreign resource prices
Market Power: Monopolies and cartels that control the price of those resources.
-Increase in resource prices: SRAS <----
-Decrease in resource prices: SRAS ---->
Productivity = total output/total inputs
More productivity = lower unit production cost ---->
Lower productivity = higher unit production cost <----
Government Regulation: creates a cost o compliance = SRAS <----
Deregulation: reduces compliance cost = SRAS ---->
Full Employment – Equilibrium exists where AD interests
SRAS and LRAS at the same point.
Recessionary Gap - exists when equilibrium occurs below full employment output.
-AD decrease shifts to the left
Inflationary Gap- exists when equilibrium occurs beyond full employment output.
-AD increases shifts to the right
Interest Rates and Investments Demand
Money spent on expenditures on:
o New plants ( factories )
o Capital equipment ( machinery )
o Technology ( hardware and software )
o New homes
o Inventories ( goods sold by producers )
· How do a business make investment decisions?
o Cost / Benefits Analysis
· How does a business determine benefits?
o Expected rate of return
· How does a business count the cost?
o Interest Cost
· How does a business determine the amount of investment they undertake?
o Compare expected rate of return to interest cost
§ If expected return > interest cost, then invest
§ If expected return < interest cost, do not invest
Real ( r% ) vs. Nominal ( i% ) (pie)inflation
What’s the difference?
· Nominal is observable rate of interest. Real subtracts out inflation (pie%) and only known ex post facto.
How to compute the real interest rate
r%= i% - pie%
What determines cost of an investment decision?
· Real interest rate ( r%)
What is the shape of investment demand slope?
· Downward sloping
Why?
· When interest rates are high, few investments are profitable. When interest rate are low, more investments are profitable.
*The Investment Demand Curve*
Cost of production
- lower cost shifts ID ---->
-Higher cost shifts ID <----
Business Taxes
-lower business taxes shift ID ---->
-higher business taxes shift ID <----
Technological Change
- New technology ---->
- Lack of technology <----
Stock of Capital
- If an economy is low on capital then ID shifts ---->
- If it has much capital then ID shifts <----
Expectations
- positive expectations shift ID ---->
- negative expectations shift ID <----
LRAS: represents a point on an economics production possibilities curve and it is a vertical line at an output level that represents the quantity of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible.
-always at full employment
-does not change as price level changes
-shifts outward if there is a change in technology, resource, or there is economic growth.