It has another related downside: it's not a strong driver of economic productivity, as the President recently pointed out [1]. [1] http://www.economist.com/new

It has another related downside: it's not a strong driver of economic productivity, as the President recently pointed out [1]. [1] http://www.economist.com/news/briefing/21708216-americas-president-writes-us-about-four-crucial-areas-unfinished-business-economic http://www.economist.com/news/briefing/21708216-americas-pre...