Ols estimator, Managerial Economics

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The variance of the OLS estimator is VAR( ^B)=σ2 /ns2x , where   s2x=£x2/x You're hired to estimate   and you're going to be paid according to the accuracy of your estimate. Specifically, your revenue is ¥/std (B). You can buy as many observations as you want at
price  . The sample variance of , never changes. How many observations should you buy?


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