Aggregate Demand
total planned real expenditure on goods and services produced within a country in a given time period.
C+I+G+(X-M)
aggregate demand curve shows a relationship between…
Aggregate Demand and the general price level, and real gdp
Lower GPL =
expansion of AD = higher real GDP
Higher GPL =
Contraction of AD = lower gdp
why the AD Curve Slopes Downwards
Real income effect
As the price level falls, the real value of income rises, and consumers are able to buy more of what they want or need
– this is known as the real money balance effect or real income effect
- the change in income is due to the change in the price level
Balance of trade effect
If UK price level rises, less demand from other counties for UK goods, so less goods exported, so net trade decreases and AD contracts
Interest rate effect
High interest rates - more saving - less consumption - inward shift of AD
Causes for fall in AD
Causes for increases in AD
External Shocks and Aggregate Demand
External shock definition
unexpected economic events cause changes in demand, output and employment
Consumption (C)
Consumption is spending on consumer goods and services
Marginal Propensity to Consume (MPC)
Marginal propensity to consume is the change in spending following a change in income (ΔC/ΔY).
o receives extra pay of £2000 and spend £1500
o MPC is £1500 / £2000 = 0.75
o rest is saved so marginal propensity to save (MPS) is 0.25
Factors that affect consumer spending
Importance of Consumer Confidence
CC surveys measures a range of consumer attitudes, including forward expectations of the economic
situation and households’ own financial positions, and their views on making major purchases such as a new car or home
improvements.
- Keynesian economists refer to this as animal spirits.
Formula for saving in a CLOSED economy
Disposable income (yd) = Consumption + saving
yd = c + s
Disposable income - income after taxes and benefits
Saving ratio
Real interest rate
The nominal interest rate adjusted for inflation.
A positive real interest rate incentivises saving
How Price Expectations affect level of household saving
If consumers expect prices to fall (i.e. deflation) they may choose to save more now
How job security affects household saving
If unemployment rises = job security decreases = more people save more as a precaution
How consumer confidence affects household saving
When consumer confidence is strong, people are more willing to spend/borrow and save less
Importance of saving
Business survival