Based on earnings and book value, Berkshire fans consider the Class A very attractive now, at around $100,000 a share. After rising just 3% in 2009, the stock, which is way below its late 2007 peak of $149,000, fetches a mere 1.2 times our estimate of the company's year-end 2009 book value of $84,500 a share -- compared with an average 1.65 times in the past decade. The stock rarely has been cheaper, relative to book value, in 15 years.

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