It is hard to overstate the significance of this change. Buffet was switching at midcareer from a proven, lucrative investment approach that focused on the balance sheet and tangible assets, to an entirely different one that looked to the future and emphasized the income statement and hard-to-quantify assets like brand names and market share. To determine margin of safety, Buffett relied now on discounted cash flows and private market values instead of Graham’s beloved net working capital calculation. It was not unlike Bob Dylan’s controversial and roughly contemporaneous switch from acoustic
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