What are investors to do throughout such economic mayhem?
Personally I would (and am) avoiding US treasury bonds which look like the next asset bubble about to burst, and go for gold which will be the next bubble to form as the world struggles to dig itself out of this very big hole.
Eventually the world will emerge from this crisis, just as it emerged from the Great Depression of the 30s, but we have not even seen the bottom yet, let alone begun the recovery phase.
Best of luck!