Dimitriy V. Masterov
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 Apr6 comment Endogenous covariate in first-difference panel data model You might get better results in CrossValidated or the economics stack site. Dec19 awarded Caucus Dec12 awarded Critic Dec9 comment Consumer Surplus Hint: the height of the demand curve gives you willingness to pay for each unit. CS is the difference between that curve and the price the consumers actually paid on all the units that were consumed. However, I am not sure what "sales level" means. Is that price? Nov26 revised Claim: Mathematical models of the economy have thousands of variables added 1 character in body Nov25 answered Claim: Mathematical models of the economy have thousands of variables Nov7 comment Easy (?) application of Lagrange multiplier Should the second $a_L$ in (2) and the one in $3$ be $a_H$s? Nov3 revised How do I find if this estimator is unbiased and also its variance? added 17 characters in body Nov3 revised How do I find if this estimator is unbiased and also its variance? added 6 characters in body Oct31 revised How do I find if this estimator is unbiased and also its variance? edited body Oct31 revised How do I find if this estimator is unbiased and also its variance? edited body Oct31 answered How do I find if this estimator is unbiased and also its variance? Oct31 comment How do I find if this estimator is unbiased and also its variance? Is $y_i=\alpha + \beta x_i + u_i$? Oct29 comment Finding the optimal combination for the Cobb-Douglas function given a budget Hint: solve for K as a function of L, budget, and prices. Plug that back into the Q equation. Now you have a maximization in one variable, L. It might make it easier if you take the natural log of the Q equation to make things easier first. Oct27 comment A sufficient condition for a good to be normal There's some graphical intuition in Fig 1 here. Oct22 comment Aggregated demand function for several similar offers? It's not entirely clear what you are asking. I would recommend taking a look at chapter 2 of Kenneth Train's Discrete Choice Methods With Simulation. Oct3 comment Convergence of probability It's also known as continuous mapping theorem. Oct3 comment Convergence of probability There is a theorem, occasionally called Slutsky's, that says that you can "pass" $plim$s though nonlinear, continuous functions, which is something you can't do with expectations. Summation of squared terms is a kind of function. Sep30 awarded Explainer Sep29 comment Looking for resources for understanding derivation of demand from utility Two hints: Try taking the natural log of the utility function to make the differentiation easier. It will still represent the same preferences. Another route to take is to recognize that this is a special case of the Cobb-Douglas utility function with all the exponents set to one.