The youtube version of Market Monetarism
One way to study the reasons and the background for the Great Recession is to read Market Monetarist blogs. Another way is to read some quality economic research in economic journals and working papers. There is however also a way for the more lazy and less academically inclined. One can have a look at YouTube. Some time ago I can across this excellent presentation Scott Sumner did on "What can asset prices tell about the Great Recession". Have a look - I only miss one thing in Scott's story and that is the importance of none-US factors especially the role of European demand for dollar as a key cause for the passive tightening of US monetary conditions in 2008/9.