In this link, eminent economist and market strategist David Rosenberg highlights many of the issues that are currently contributing to ‘uncertainty’ in world markets:
David Rosenberg on Yellen’s ‘Uncertainty’
For the sake of clarity, ‘uncertainty’ generally means ‘pessimism’ when used by economists. However, they should not be confused as one and the same thing.
Rosenberg lists off a number of topics that contribute to a sentiment of pessimism. Unfortunately, his argument is far too one-sided. He concludes his diatribe as follows: