irbnb Inc. and Uber Technologies Inc. popularized the concept of a "sharing economy," where regular consumers share things like car rides and apartments. Now they are sprucing up their services to appeal to the buttoned-up business traveler. The fast-growing technology startups this week each announced new versions of their apps geared toward booking business trips. Both companies also struck deals with Concur Technologies Inc., the expense-reporting software used by more than 20,000 companies.

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