EC140 Lecture 6: EC140 - Lecture 6

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Net exports fall as income increases net exports are exports minus imports. This could be simplified to: ae = a+zy. Substituting and rearranging, we get: y = a/(1-z) How much does income increase due to an increase in autonomous expenditure: y = a/ (1-z) Marginal propensity to spend (z), is the slope of the ae function: z = b(1-t)-m. Changes in government purchases: governments may affect income by increasing/decreases government purchases, g, effect calculated using the simple multiplier. Governments may change tax rates: changes slope of the ae curve, reduction in taxes rotates ae curve up, increase in taxes rotates ae curve down. Our model is very simple, and is the basis for later models. Policy outcomes are very simple: increasing government spending, g, increases incomes, decreasing tax rates, t, increases incomes, budget deficits don"t matter because we are looking at a single period model.

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