So as it becomes more productive, there's a hunger for more raw materials. Where do you get those raw materials from? Well, if you're a small country like the United Kingdom or Japan, your raw materials are limited. But there's the rest of the world, and especially the rest of the world that is not at the same level of technological sophistication yet. So you can perhaps use your military in order to force them to trade with you. Similarly, what do you do with all of those finished goods? You have limited markets on your islands, but what if you could sell to the hundreds of millions of people who aren't directly in your country?