A partial but not complete list of worries includes: China melt down, Yuan reevaluation after effects or Taiwan action,
global biomedical epidemics, e.g. Avian Flu, or bioterrorism outbreaks,
trade wars (China, EU), major hedge fund bankruptcies, a PBGC (Pension Benefit Guaranty Corp.) shortfall crisis, major junk bond or emerging market bond default, a bank derivative blowup, Fannie Mae issues plus
possible assorted natural disasters.