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In the Keynesian cross diagram, the upward sloping blue line represents the aggregate expenditure for goods and services by all households and firms as a function of their income. The 45-degree line represents an aggregate supply curve which embodies the idea that, as long as the economy is operating at less than full employment, anything ...
The circular flow diagram is an abstraction of the economy as a whole. The diagram suggests that the economy can reproduce itself. The idea is that as households spend money of goods and services from firms, the firms have the means to purchase labor from the households, which the households to then purchase goods and services.
The AD–AS or aggregate demand–aggregate supply model (also known as the aggregate supply–aggregate demand or AS–AD model) is a widely used macroeconomic model that explains short-run and long-run economic changes through the relationship of aggregate demand (AD) and aggregate supply (AS) in a diagram.
Keynes interprets this as the demand for investment and denotes the sum of demands for consumption and investment as "aggregate demand", plotted as a separate curve. Aggregate demand must equal total income, so equilibrium income must be determined by the point where the aggregate demand curve crosses the 45° line. [63]
A post-Keynesian theory of aggregate demand emphasizes the role of debt, which it considers a fundamental component of aggregate demand; [7] the contribution of change in debt to aggregate demand is referred to by some as the credit impulse. [8] Aggregate demand is spending, be it on consumption, investment, or other categories. Spending is ...
A traditional AD–AS diagram showing a shift in AD, and the AS curve becoming inelastic beyond potential output. The AD–AS model is a common textbook model for explaining the macroeconomy. [53] The original version of the model shows the price level and level of real output given the equilibrium in aggregate demand and aggregate supply.
Average propensity to consume (APC) (as well as the marginal propensity to consume) is a concept developed by John Maynard Keynes to analyze the consumption function, which is a formula where total consumption expenditures (C) of a household consist of autonomous consumption (C a) and income (Y) (or disposable income (Y d)) multiplied by marginal propensity to consume (c 1 or MPC).
The quantity of aggregate output supplied is highly sensitive to the price level, as seen in the flat region of the curve in the above diagram. Long-run aggregate supply (LRAS) — Over the long run, only capital, labour, and technology affect the LRAS in the macroeconomic model because at this point everything in the economy is assumed to be ...