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Math Help - Marginal Propensity to save/consume

  1. #1
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    Marginal Propensity to save/consume

    I am given the marginal propensity to SAVE:
     <br />
\frac{dS}{dI}=\frac{1}{2}-\frac{1.8}{\sqrt[3]{3I^2}}<br />

    and the first part of the question asks me to: find marginal propensity to CONSUME when total national income (I) is 81 billion

    what exactly do I need to do? what is the formula used?

    The chapter I am working on is integrals. Thank you!
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  2. #2
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    I searched a little online and saw that dS/dI = 1 - dC/dI so if i wanted the marginal propensity to consume could I use dC/dI = 1 + dS/dI?
    Last edited by lil_cookie; February 22nd 2010 at 07:34 AM.
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  3. #3
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    any help is appreciated....thank you
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