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Two Americans won the Nobel Prize in economics. Who are they?

The work of William Nordhaus focused on climate change, while Paul Romer examined tech factors in calculating economic growth.
Per Stroemberg, Goeran K Hansson and Per Krusell announce the laureates of the Nobel Prize in Economics during a press conference at The Royal Swedish Academy of Sciences in Stockholm on October 8, 2018. - The Nobel Prize for Economic sciences 2018 was awarded US economists Paul M Romer and William D Nordhaus. 
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