When warren buffett was asked to explain in April why Berkshire Hathaway, his investment firm, had built a 14% stake in Occidental Petroleum, or Oxy, over a frenetic fortnight of buying starting two months earlier, his answer was long. It included a digression into John Maynard Keynes’s “General Theory” of 1936, and a rollicking description of why Wall Street still resembles a gambling parlour, as it did back then. He barely mentioned the Houston-based oil company, now worth $69bn, besides saying that he had read Oxy’s annual report for 2021 and that Vicki Hollub, its boss, “made nothing but sense”. The pithiest explanation came from
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