Who said microeconomics was not useful :-) For those who are not used to that, it's a very simple linear regression, followed by an estimated demand equation,

Who said microeconomics was not useful :-) For those who are not used to that, it's a very simple linear regression, followed by an estimated demand equation, which you then turn into profit by multiplying each side by prices. To find the local optimal, you look for the spot where the 1st derivate cancels (and the second is negative, unless you have a quadratic equation like that) It's an example so well though and so simple that it should be in economics textbook, so that students see how to make more money with a simple application of sound principles. (if the excel spredsheet was turned into an online collection, using say OLS to calculate the estimators, Victor would have had a SAAS pricing software instead of entering the stuff manually on his laptop! ain't that cool ?)