I bet the prospects of economic malaise in China are keeping a lot of policy and economics wonks awake at night.
Well, if they are heavily invested in China or from whence China imports raw materials.
Otherwise, I am not so worried about reduced demand by China for raw materials. Maybe get those commodity prices to cool down some.
And, really, why should they worry? US.gov and the Fed and the Treasury will make good the losses of the largest investors. That is the way is has been for a few decades, now:
1. Invest in volatile foreign market without pricing risk accordingly.
2. Rake off profit while it lasts.
3. Get the taxpayers to make up the lost principal.
4. Repeat with new risky market.