8. Abby Cohen
Abby Cohen is the former chief US strategist for Goldman Sachs and was once dubbed the most powerful woman in the country. Unfortunately, her failure to see previous share-price crashes and her unrealistic upwards forecasts would be her undoing. When the housing market crashed in 2008, the blame was placed in part on her misguided ideas. In the end, she would get the boot—going from financial hero to a big, fat zero.