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- [Tyler] Now Socrates --
I actually disagree with him --

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he said the only true wisdom
is in knowing that you know nothing.

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So I'm an economist.

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I'm not a philosopher.

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So what does the economist say?

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The economist does not say
that he or she knows nothing.

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The economist says 
"I know one thing --

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maybe it's only one thing,
but it's one thing."

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And that one thing is

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that the demand curve 
slopes downward.