These are Bruce Berkowitz's comments from his interview on Wealthtrack:
BRUCE BERKOWITZ: Berkshire has a tremendous amount of flow from the premiums received from long-term insurance policies. That flow has to be invested in very secure, sound financial instruments: electric utilities cost plus or a railroad business which has the stability unlike many businesses. So here he’s taking money that’s actually got a zero cost to it and then investing it at a reasonable, not at an egregious yield, but at a reasonable investment yield. But when the cost is zero, the returns are phenomenal. He’s brilliant. Warren Buffett is being Warren Buffett in that he’s married another great big business to Berkshire Hathaway that’s going to make a sizeable difference overtime.
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