Summary: In 2007, the market crashed due to the worst financial crisis since the great depression of the 1930's ! For private investors that crisis was totally unexpected, for most of the financial experts too but ... for some asset managers that crash met "positively" their expectations. Those people shorted the market (betting downwards) and recorded huge profits. Unbelievable isn't it? Not totally when we look closely to their methodology : 1. The market environnent - Sig