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But it turns out those ratings and reviews aren’t quite as bulletproof as Amazon’s return policy or delivery estimates. A new study from the University of Colorado Boulder found very little correlation between user ratings on Amazon and quality or resale value.

But for now, the situation amounts to a stand-off between Apple and major companies offering?subscriptions?and digital items. Apple CEO Steve Jobs said in a statement at the time of the original announcement, “Our philosophy is simple—when Apple brings a new subscriber to the app, Apple earns a 30 percent share; when the publisher brings an existing or new subscriber to the app, the publisher keeps 100 percent and Apple earns nothing.”

But in the field of R&D human resources, China has a long way to go to get closer to the US, which boasts the world's best strategy in recruiting and retaining talent, as well as cultivating world-class scientists and technologists.

But even Tesla is no rival for gasoline vehicles.

But Didi would face mounting competition from Yandex Taxi, which holds about 27-percent share of the local ride-hailing market.