For a long time most economists thought that slavery was not just bad, but also inefficient.

ECONOMIST: Economics focus

Operating as such, they add, is not just inefficient but also a dirty proposition that results in more pollution.

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They're also inefficient, all but one with a return on equity (ROE) in the single digits.

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Current smartphones that support LTE are not only pricier than their 3G counterparts but also bulkier and highly power-inefficient.

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But big income gaps can also be inefficient, because they can bar talented poor people from access to education or feed resentment that results in growth-destroying populist policies.

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But much of the cynicism is centered on corn-based ethanol that some consider not just an inefficient fuel source but also one that also creates food shortages, driving up the cost of feed for livestock producers.

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But that incumbent method is also extremely costly and inefficient.

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