If you look at how the US economy has suffered over the last 15 or 20 years, it's in significant part because we haven't done the investments in research and development and infrastructure and other public goods that are necessary for our growth. And, unfortunately, we're going to be feeling that overhang for a long time to come, because it's the investments we made in the 1950s and '60s and '70s that result in some of the greatest technological breakthroughs that we enjoy today.