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1 (of 4) Paul M. Romer 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 4) Paul M. Romer after receiving his Prize at the Stockholm Concert Hall, 10 December 2018.

© Nobel Media. Photo: Alexander Mahmoud

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3 (of 4) 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 4) Paul Romer after signing a chair at the Nobel Museum in Stockholm. As part of their visit to the Nobel Museum all laureates are asked to sign a chair.

© Nobel Media. Photo: Alexander Mahmoud