In 2011 Tien Tzuo was worried. He was the CEO of a hot tech company with an idea whose time seemed to have come. Zuora makes business software that lets companies of all kinds sell their products by subscription. Tn recent years one company after another has embraced the "subscription economy," signing up customers online to long-term contracts that generate the business owner's holy grail: recurring revenue. Meals, movies, clothes, toothbrushes, cosmetics, software, textbooks, yarn, snacks, flights-you can buy them all by subscription now.
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