I've been meaning to write this post for some time. Scott Sumner's post spurs me to write it now.

First let me ask my dumb econometrics question. It's a very simple question, and I really ought to know the answer. But I don't.

**Q1.** If you estimate a linear regression, using Least Squares or whatever, **will the estimated residuals always sum to zero? **If the answer is "yes", then skip the next question. [**Update**: Ben, Norman, and Matthew tell me in comments the answer is "yes", provided there is a constant term in the regression, and I want there to be a constant term.]

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