 This is a redrawn figure from Saxon Warner, a famous paper from back in 2001. Each dot on here is a country, and what we have at the bottom is how much of the economy of that country was exports of natural resources in the year 1970. So the countries that exported a lot of natural resources are out here. The countries with very little natural resources as a fraction of the total economy are down there, and then what's shown here is how much did that economy grow over the next 20 years. What you'll notice is that all of the countries that really relied on exporting natural resources in 1970 had very slow or actually negative growth over the next 20 years. Some countries that did not have many natural resources also had slow growth, but all of the countries with fast growth did not rely on natural resources. Now, ecorrelation does not tell you what caused it, but there are enough reasons to believe that when you rely really heavily on natural resources, there may be a tendency to work hard to control the natural resource rather than to building a wonderful place for everyone to live, and if that's true, then there may be some relationship in here that is meaningful and reliance on natural resources may not be a good thing for having a big healthy economy.