Energy efficiency can save trillions in national costs, but its side benefits are often even more valuable: 6% to 16% higher labor productivity in efficient offices, 20% to 26% faster learning in well-day-lit schools, 40% higher sales in well-day-lit shops, faster healing in efficient hospitals.

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Employers are already paying more for valuable graduates, it says, but this system would mean they had to pay even more.

BBC: Graduate tax 'could hit UK's competitiveness'

But the numbers suggest that Bobby Pitrino may have been even more valuable.

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But I'm starting to realize that Amy is right when it comes to that even more valuable commodity: time.

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