Consider a hypothetical closed economy in which households spend $0.60 of each additional dollar they earn and save the remaining $0.40. The marginal propensity to consume (MPC) for this economy is    , and the spending multiplier for this economy is    .     Suppose the government in this economy decides to increase government purchases by $400 billion. The increase in government purchases will lead to an increase in income, generating an initial change in consumption equal to    . This increases income yet again, causing a second change in consumption equal to    . The total change in demand resulting from the initial change in government spending is    .

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A: Answer; = $ 90 billion

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