Aggregate demand is the total spending on goods and services in an economy over a given period. It is one of the most fundamental notions in macroeconomics: it largely determines activity, employment and prices.
1 What is aggregate demand?
Everything an economy spends, added up.
Definition
The sum of a country's spending
Where the demand for a product concerns a single good, aggregate demand adds up all the spending in an economy. When that sum rises, firms sell more, produce more and hire; when it falls, activity slows. It is the engine of the business cycle.
2 Its components
Four sources of spending.
①
Households through their consumption, the largest component.
②
Firms through their investment (machinery, buildings, research).
③
Government through public spending (services, infrastructure).
④
The rest of the world through net exports (exports minus imports).
3 Why it matters
It links activity, employment and prices.
The mechanism
Too weak, or too strong
When aggregate demand weakens, firms sell less, cut production and employment: this is the risk of recession. When it overheats beyond what the economy can produce, prices rise: this is inflation. Much of economic policy consists in keeping demand within the right corridor.
4 What weakens it
Incomes are its lifeblood.
The threats
A fall in income, a loss of confidence or a tightening of credit reduces demand. A subtler case: when automation eliminates jobs and dries up wages, it weakens overall demand at the very moment it increases productive capacity. This is the contradiction at the heart of algorithmic capitalism.
5 Takeaways
To remember.
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Aggregate demand is the sum of an economy's spending.
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Four components: consumption, investment, public spending, net exports.
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Too weak, it leads to recession; too strong, to inflation.
This notion illuminates these analyses