Learn Before
  • Graphical Determination of Equilibrium Output

  • Expanded Aggregate Demand Equation

Graphical Representation of Goods Market Equilibrium

The goods market equilibrium can be visualized using a diagram where the horizontal axis represents total output or income (Y) and the vertical axis represents aggregate demand (AD). This model includes a 45-degree line originating from the origin, which represents all points where output equals aggregate demand (Y = AD), the condition for equilibrium. The aggregate demand function itself is plotted as an upward-sloping line, typically with a slope less than one. Its vertical intercept represents autonomous spending—the level of demand independent of income, given by the sum of autonomous consumption (c0c_0), investment (I(r)I(r)), government spending (GG), and exports (XX). The equilibrium point in the economy, labeled A, is found at the intersection of the aggregate demand line and the 45-degree line.

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Related
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  • Consider an economy where total demand is determined by the spending of households, firms, the government, and the net effect of international trade. If the government increases the income tax rate, and at the same time, households become more pessimistic about their future financial security (independent of any change in their current income), what is the most likely direct impact on the components of total demand?

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  • Graphical Representation of Goods Market Equilibrium

Learn After
  • Graphical Representation of the Downward Multiplier Process (Figure 3.15)

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  • Impact of a Change in Autonomous Spending

  • In the graphical model where aggregate demand is plotted against total income, if the aggregate demand line had a slope greater than 1, the economy would be characterized by an unstable equilibrium.