The economic collapse we just went through in '08 will happen again because the derivatives market is still not regulated effectively. Here is the story of a brave woman who tried to prevent the '08 crash. It explains a little how dangerous the derivatives market is to the economy.
[I have been having problems embedding this video.If there are problems, there is a link under the picture and here: http://video.pbs.org/video/1302794657 ]