Sales of single-serve coffee—the kind first popularized in the US by Keurig, and widely known as K-cups—have more than tripled since 2011, MarketWatch reported in November. As of a year ago, 13% of Americans drank a coffee made in a single-cup brewer each day,according to a survey by the National Coffee Association.

“You see single-cup machines popping up in more businesses and even apartment buildings,” Ken Perkins, an associate equity analyst at Morningstar, told MarketWatch this past fall.

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