In selecting marketable securities for our insurance companies, we can choose among five major categories: (1) long-term common stock investments, (2) medium-term fixed-income securities, (3) long-term fixed-income securities, (4) short-term cash equivalents, and (5) short-term arbitrage commitments. We have no particular bias when it comes to choosing from these categories. We just continuously search among them for the highest after-tax returns as measured by “mathematical expectation,” limiting ourselves always to investment alternatives we think we understand. Our criteria have nothing to
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