I disagree. Not only can we no longer build large things, we are barely able to maintain the things we have. I lived in Cambridge MA during the repair of th

I disagree. Not only can we no longer build large things, we are barely able to maintain the things we have. I lived in Cambridge MA during the repair of the Anderson Memorial Bridge, described here: http://larrysummers.com/2016/05/31/a-lesson-on-infrastructure-from-the-anderson-bridge-fiasco/ http://larrysummers.com/2016/05/31/a-lesson-on-infrastructur... . Fixing a very modest bridge across a placid river took years, and cost far more than the inflation-adjusted original cost of the bridge (took longer than the original construction too!). Look at NASA's marvelous manned space program. It has less manned launch capability than the agency had when the Mercury program was active. But they still spend money, doing extremely important things like sending "astronauts" to camp out on Mauna Loa and pretend they're on Mars.