CAMBRIDGE, Mass. — Next month marks the one year anniversary of the collapse of the venerable American investment bank, Lehman Brothers. The fall of Lehman marked the onset of a global recession and financial crisis the likes of which the world has not seen since the Great Depression of the 1930s. After one year, trillions of dollars in public money, and much soul-searching in the world's policy community, have we learned the right lessons? I fear not.