In aggregate these businesses earned more than $9 billion pre-tax in 2011. Contrast that to seven years ago, when we owned only one of the five, MidAmerican, whose pre-tax earnings were $393 million.

from Warren Buffett – Letter To Shareholders 2011 on Rap Genius

With BNSF, Iscar, Lubrizol, Marmon Group, and MidAmerican Energy, Bershire Hathaway earned approximately 2,300,000% more in pre-tax earnings in 2011 than they did 7 years ago when MidAmerican Energy (the only non-insurance company they owned at the time) brought in $393 million in pre-tax earnings.

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