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Old 04-01-2008, 03:25 AM
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Economics math question help?

Relating earnings to schooling and workplace experience is:
ln E= 4.9 + .26S - .003S^2 - .004XS + .15X - .002X^2

What is the % impact on earnings due to one year increase in experience if S=20 and X=5?

What s the impact on the dollar value of earnings due to one yr increase in experience if S=20 and X=5? (do I plug these value in partial derivative (lnE/X)??

What is the % impact on earnings due to an increase in experience of 1% if S=20 and X=5?
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