1. How The Macro economy Works

2. Content Aggregate demand Aggregate supply
Determinants of Aggregate demand
Aggregate demand and the level of economic activity
The long run aggregate supply curve

3. Aggregate Demand
Aggregate demand measures the total expenditure in the economy as a whole
It is calculated using the following formula:
AD = C + I + G + (X-M)
C = consumption
I = investment
G = government expenditure
X = exports
M = imports

4. Aggregate Demand Curve
This shows the total level of expenditure at different price levels
The curve slopes from left to right because it is based on the following assumptions :
Bank of England sets short term interest rates
A rise in inflation is matched by a rise in interest rates
An increase in interest rates increases the cost of borrowing

5. Aggregate Supply
Aggregate supply shows the total amount supplied in the economy as a whole at each price level
In the short term aggregate supply slopes upwards

6. Interaction of AD and AS
In the short run where the AD and AS curves interact is the level of national income

7. Price level and AD / AS
If the price level changes this is represented by movements along the AD / AS curves

8. Shifts in the aggregate demand curve
Any change in the components of AD (C,I, G, (X-M) cause the curve to shift
Economic growth is represented by a rightwards shift in the LRAS curve

9. Shifts in the AS curve The AS curve may be shifted by changes in:
The size / quality of the labour force
The size / quality of capital
Expectations of inflation
Technology
The productivity of labour / capital
Wages per unit of output
Taxes / subsidies for producers

10. AD / AS Diagrams These can show: Causes of inflation
Demand deficit unemployment
Economic growth

11. Determinants of AD The determinants of AD are C, I, G, X and M
C represents the consumption expenditure of the economy as a whole
There are a number of factors that influence the level of C including:
Tax rates
Inflation
Wage increases
Interest rates
Credit
Wealth
Shares
Property
Savings
Bonds

12. Determinants of Consumption
Consumption is affected by interest rates because as interest rates rise the opportunity cost of spending increases and saving becomes more attractive
In addition as interest rates rise if people have high levels of borrowing their real income will be reduced decreasing rates of consumption

13. Determinants of Consumption
Taxation rates influence consumption as the higher the rate of tax the lower peoples real income and therefore the lower the rate of consumption
Credit influences consumption as if credit is readily available it will increase consumption levels
Wealth influences consumption as if people have wealth in the form of property, stocks etc they are more likely to consume at a higher rate

14. Determinants of Investment
Investment represents all spending on capital items which are used to generate future incomes
Examples of investment are expenditure on machinery, buildings, equipment and infrastructure
Investment expenditure is influenced by:
Interest rates
Sales forecasts
Inflation projections
Expected rates of return

15. Determinants of Investment
When making investment decisions businesses need to ensure that there will be demand to meet the production the investment generates it is therefore important for them to use sales forecasts when making investment decisions
When making investment decisions firms look at expected rates of return for the action to enable them to decide in the project is worthwhile

16. Determinants of Investment
There is an inverse relationship between investment and interest rates
As interest rates fall the cost of investment decreases therefore firms are more likely to invest
Inflation can influence investment as if there is high inflation firms are more likely to make investment decisions as their return is likely to be higher in real terms

17. Determinants of Government Spending
Government expenditure includes all spending by the public sector in areas such as defence, healthcare, education, social welfare etc
Government expenditure is heavily influenced by political factors
Government expenditure is also influenced by the rate of taxation in the country as this is used to fund the spending

18. Import and Export Expenditure
If more money is being spent on imports than exports (balance of payments deficit) AD will be reduced
If more money is being spent on exports than imports (balance of payments surplus) AD will be increased

19. Economic growth and Imports
When the economy grows quickly consumption is high and British consumers have a tendency to spend their money on imports
This leads to a larger balance of payments deficit

20. AD and Economic Activity
A change in the level of AD can cause influence the level of national income
If an economy is operating below its potential level then a shift in AD causes national income to rise in the short term
The impact of the change in AD depends on how close the economy is to full capacity

21. Long Run Aggregate Supply Curve
LRAS is determined by the productive resources available in the economy and the productivity of the factors of production (land, labour and capital)
In the long run the assumption is that supply is not dependent on the level of prices in the economy therefore the LRAS is vertical

22. LRAS curve
The LRAS is vertical – the same level of income at all price levels
This is the normal level of output in an economy
To move the LRAS outwards there needs to be improvements to productivity and efficiency in the economy - this represents economic growth

23. Determinants of LRAS Technology Productivity Attitudes Enterprise
Factor mobility
Institutional structure of the economy
Economic incentives

24. Summary
Aggregate demand shows the total amount of expenditure in the economy
Aggregate supply shows the total amount supplied in the economy at each price level
AD = C + I + G + (X-M)
Any change in the determinants of Aggregate demand will cause the AD curve to shift
In the short term shifts in the AD curve can cause an increase in national income
The long run aggregate supply curve is vertical
If LRAS increases the curve shifts out and economic growth has occured