I am watching the lecture 3 elasticity. At13:29 the professor is talking about the relationship between Elasticity and Revenue; he says " If the elasticity is between 0 and minus 1, then raising prices will raise revenues. If the elasticity is greater than minus 1, then raising prices will lower revenues." But he didn't prove that? Who can help me to explain why? Tks a lot!

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Thank you very much!

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