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The Slope of the AE Curve Is

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The slope of the AE curve is .80. What is the multiplier? Everything else the same, by how much does equilibrium aggregate expenditure increase if
a) exports increase from $1.75 trillion to $2.25 trillion.
b) government expenditure on goods and services decrease from $2.0 trillion to $1.8 trillion.
c) investment increases from $1.2 trillion to $2.3 trillion.


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