Robert J. Gordon, «Is U. S. Economic Growth Over? Faltering Innovation Confronts the Six Headwinds», NBER Working Paper 18315, August 2012.
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Эта цифра взята из «Game Plan for a Future-Ready Workforce», Futurist, November – December 2013, интервью с Ed Gordon, author of Future Jobs: Solving the Unemployment and Skills Crisis, conducted by Rick Docksai.
