we continue to undersave, underinvest in people, infrastructure, and capacity. get that together, then their ascendency will coincide with our decline. >> we've had periods like this before. >> yeah. >> i mean, you're optimistic we get it together or do you think we're the roman empire? >> no, look, i hope we get it together. what i don't see is a debate on the strategy -- >> how many people have been -- you do look at the past 3,000, 4,000 years, and how long do a leading civilization, they have a couple of hundred of years. >> we've had a good century. >> we've been there for a couple of hundred already. >> but the people that write about the rise and fall of great powers, they often look to nations that outstrip their capacity to save. they extend themselves militarily or economically. and then, ultimately, it just becomes hard to sustain. >> china was on top for a while, too. >> china, in a mid-19th century was the largest economy in the world, for sure. and they went through a very difficult and long period of time. >> they've got a lot of people. they have