Suppose 
measures an economy's personal consumption expenditure and x the personal income, both in billions of dollars. Then, 
measures the economy's savings corresponding to an income of x billion dollars. Then ![]()
src="https://sciemce.com/media/3/ppg__cognero__3.4_Marginal_Functions_in_Economics__media__1d5fc118-6ff2-4807-a45b-7a75f91d2014.PNG" style="vertical-align:middle;" />.
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The quantity dS/dx is called the marginal propensity to save.
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For the consumption function 
, find the marginal propensity to save.
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A. $0.43 billion/billion dollars
B. $0.286 billion/billion dollars
C. $0.68 billion/billion dollars
D. $0.337 billion/billion dollars
Answer: B
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