[Huliwang]

Don't play with words...no direct relation or no relation?.

Stock market collapse 1929....USA goes into depression.
Stock market plunge jn 1997....Asian countries go into crisis bankruptcies everywhere.
Stock market fall by 50% in 2009....US fianncial crisis due to incompetence in regulating the banks ...Lehman collapsed many ordinary people suffer.

You are talking rubbish. Stock market reacts to news. It was the other way that plunged the stock market.       

1929 USA goes into depression..... stock market reacted to the depression and collapsed.
1997 Asian financial crisis due to over leverage --- stock market reacted and plunged sharply.
2007 Subprime ... Market reacted and plunge.
2009  US financial crisis due to incompetence in regulating the banks ...Lehman collapsed causing the stock market to to fall by 50%.