Because China is a closed market. Try sell some Chinese stocks if you think it's too high and then you find out you can't even buy them in the first place.
Today is just a mega stop loss triggered by carry traders borrowed against Yen. They can either exit their positions or they can sell index futures to hedge. Either way it brings down the market. Who says "hedging" by selling the index won't move market?
Just shut up Algorithm, you don't know...
The only reason to hedge as oppose to exiting your position is that your positions are too large for the market to absorb quickly, or you have a basket of stocks too expensive to unwind one by one so you might as well just sell the index.
So either Algorithm is trading $100 million plus with...
It's just a matter of what Ben Bernanke does. If he tigtens up dollar goes up and vice versa.
What happens is he lets the dollar to break this supposingly unbreakable low level, that should tell you something. Unless he's trying to fake everybody and squeeze some speculators.
Always...