In the solution to Problem 93.2.3 by Paolo Paruolo, γ* ≡ (β, ,Ik)′ should be replaced by γ* ≡ (βí,I*)′ throughout the text; the same change should be made for *; γ should be replaced by γ* in the second line and two lines before the references; “left-hand side” should be “right-hand side” in the second line after (4); “column” should be replaced by “row” in the last line before the references. Finally, reference \1] is Preprint 1992.2, Institute of Mathematical Statistics, University of Copenhagen; submitted to Econometric Theory.