my conversation with kevin osnos of "the new yorker." ♪ ♪ >>> "amanpour" on pbs was made possible byenerous support of roslyn p. walter. ♪ >>> good evening, everyone. welcome to the program. i'm christiane amanpour in london with the global perspective. the american president takes every opportunity to tout america's booming economy as the success story of his first year in office, whether on twitter, last week at the capitalist mecca in davos, switzerland, or tomorrow during his state of the union address. >> there has never been a better time to hire, to build, to invest and to grow in the united states. america is open for business and we are competitive once again. >> so is president trump's tax reform responsible for reversing the american carnage that he deride it at his inaugural last year? and is the boom sustainable? joining me now from new york is the economist and former u.s. treasury secretary larry summers and from stanford university in california, the historian and writer niall ferguson, whose latest book is "the square and the tower." gentlemen, welcome to the program