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'Is she the chief economist? ... After she goes and studies economics in college, she can come back and explain that to us,' U.S. Treasury Secretary Steven Mnuchin on Greta Thunberg https://t.co/vwnH4JGKbN Follow the latest #ReutersDavos coverage https://t.co/YQnDm02duk #wef20 https://t.co/nGllmjBMdL