$\hat{\beta}$ should be $\beta$ at start of 7.1

[MattMalis]

The second paragraph of 7.1 reads:

We begin by setting out the assumptions we will need for establishing the large-sample properties of OLS, which are the same as the assumptions needed to ensure that the best linear predictor, $\hat{\beta} = E[X_i X_i']^{-1} E[X_i Y_i]$ , is well-defined and unique.

I believe this should say $\beta$ instead of $\hat{\beta}$

[mattblackwell]

Thanks for catching this!