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If the marginal propensity to consume were 100 percent, there would be no investment, and, soon, no income.
FORBES: The Flawed Assumption Behind Ending The Bush Tax Cut For The Rich
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You could compute a multiplier, which was simply the reciprocal of one minus the marginal propensity to consume, or, even more simply, the reciprocal of the marginal propensity to save.
FORBES: The Flawed Assumption Behind Ending The Bush Tax Cut For The Rich
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To the extent that high oil prices played a role in the recessions of the early 1980s and 2008-09, the main reason is that oil-producing countries tend to have a lower marginal propensity to consume their income, denting global demand.
ECONOMIST: The economic impact of high oil prices