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aggregate demand and supply equation

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If an economy is in equilibrium when net taxes = $50 trillion, saving = $40 trillion, government purchases = $50 trillion, exports = $30 trillion, and imports = $10 trillion, then planned investment spending must equal
a. zero
b. $50
c. $10
d. $20
e. the answer is indeterminate

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Aggregate demand and supply equations are shown.

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