When a product is sold, sellers can print out a shipping label, attach it to the package and drop it at the post office.

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Drop in your tablet, and the whole package looks a lot like something that might come straight from Cupertino.

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It is hard to understand why Mr Obama opposes this idea, beyond a traditional Democratic distaste for helping out big oil firms indeed, he has said he might drop his objections in an effort to push a bipartisan legislative package on energy.

ECONOMIST: Energy and the environment