Robert Stavins of Harvard University argues that the thorny notion of sustainable development can be reduced to two simple ideas: efficiency and intergenerational equity.

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The answer is simple: capital efficiency .

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Hawker Beechcraft has kept the aircraft simple and reliable while adding advanced technology to improve efficiency, safety and functionality.

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Then there is the simple notion that cost cutting must be good, because it makes for greater efficiency, and efficiency is good.

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