Black Swan Theory by Nassim Nicholas Taleb , The Black Swan Theory explains the existence and occurrence of high-impact , hard-to-predict , and rare events that are beyond the realm of normal expectations which no economist can predict. Any economist that says that they can predict the future is a fraud.Most of the economists are expecting after the fact they explain what HAPPENED , the banking system for 12 years have been building risks on things we do not understand based on bogus economic models financial risk management tools that was unacceptable on says Nassim Taleb