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But market experts have struggled to find value in a company that has consistently posted losses, and warned that it may never be profitable. "The business is unprofitable, new entrants can enter the market, there is potential regulatory risk, and it is very price sensitive. What is there to like about this opportunity?" Robert Johnson, professor of finance at Heider College of Business, Creighton University in Omaha, Nebraska said.

But another group is growing just as quickly as the?company’s human workforce: the number of robots working alongside people?in Amazon fulfillment centers. The company said this week that it has 45,000 “robotic units” operating in 20 distribution centers working with people to fill and ship customer orders.

But analysts expressed concern over the challenges that lay ahead in promoting large-scale use of biofuels.

But Zhang acknowledged that the lack of search-and-rescue personnel hinders the department from offering better services.

But Trump was far more cordial to May's face. He complimented her leadership and expressed his great respect for her.