Steven D. Levitt noted that some of the companies selected as "great" have since gotten into serious trouble, such as Circuit City and Fannie Mae, while only Nucor had "dramatically outperformed the stock market" and "Abbott Labs and Wells Fargo have done okay". He further states that investing in the portfolio of the 11 companies covered by the book, in the year of 2001, would actually result in underperforming the S&P 500.[6] Levitt concludes that books like this are "mostly backward-looking" and can't offer a guide for the future."[7]