 Many economic analyses say that sort of the gross domestic product, the GDP, is good. And a bigger GDP spending more money in the economy is a good thing. Well, there's a lot of useful information of this, but it's not completely accurate. These pictures from the United States Geological Survey are showing the effect of Hurricane Katrina on the coast of Mississippi near Biloxi in the USA. What you see here is a picture on top from September 1998, which is well before the hurricane, and one on the bottom from August 31, 2005 after the hurricane. You will notice things such as there was a pier house, and then it was gone, and there was a pier, and then it was gone, and there was this beautiful pre-Civil War mansion, and, well, try to find it down below, and, you know, it's not there anymore. Now, if they spend money to fix these things, that money spent fixing these will show up in the GDP, and people will say, oh, look, the economy grew. But that might not be a good thing. If we see more disasters in the future, those disasters break things that we have to fix, those will show up as a growing economy, but that doesn't mean that people are better off, and in that case, we probably need better measures of what we're seeing.