Illustration : Vicky Leta for Quartz Advertisement A version of this article originally appeared in Quartz’s members-only Weekend Brief newsletter. Quartz members get access to exclusive newsletters and more. Sign up here . A little more than a decade ago, McDonald’s, America’s largest single buyer of ground beef, noticed that beef prices were surging far ahead of inflation. But it took another five years or so to figure out what was going on. Earlier this month, McDonald’s filed what may be

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