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1 (of 5) William D. Nordhaus receiving his Prize from H.M. King Carl XVI Gustaf of Sweden at the Stockholm Concert Hall, 10 December 2018.

© Nobel Media. Photo: Alexander Mahmoud

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2 (of 5) William D. Nordhaus after receiving his Prize at the Stockholm Concert Hall, 10 December 2018.

© Nobel Media. Photo: Alexander Mahmoud

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3 (of 5) Waiting for the award ceremony to start - Paul M. Romer, William D. Nordhaus, Frances H. Arnold and Donna Strickland just before they receive their medals and diplomas.

© Nobel Media. Photo: Alexander Mahmoud

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4 (of 5) William Nordhaus at the Royal Swedish Academy of Sciences press conference on 7 December.

© Nobel Media. Photo: Alexander Mahmoud

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5 (of 5) The same morning after he learned he'd been awarded the 2018 Prize in Economic Sciences, Professor William Nordhaus taught his intermediate macroeconomics class at Yale University.

Photo: Yale University/Mara Lavitt