As i was studying the USA stock market charts from last few days , i was sensing that , especially S&P 500, will correct more then Dow jones Industrial average From the perspective of TA Stock market correction has started on these Indices . As far as i know , in USA stock market S&P 500 has more importance , If a most important Stock market Like the DJI & S&P 500 crashes its effect will be highly negative Indian Indices like Nifty , i feel some thing more crash is coming on already down market 
i may be wrong as market is always right , share your views
