Warren Buffett's $5 billion investment in Goldman Sachs Group Inc. was partly a bet on the "integrity" of the Wall Street firm, Ronald Olson, a Berkshire Hathaway Inc. director, said.

"When Warren and Berkshire stepped up to make this investment, it was a very strong statement of its belief, his belief, in not just the strength of Goldman but its integrity," Olson said in an interview this week with Bloomberg Television.

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