Index component shares with the individual components of the status of the stock. If this kind of index trend indicators have effect, its stocks will be subject to ups and downs in the stock investor attention. Changes in the status of stocks, and its price fluctuations are also related. If a file may be upgraded to a constituent stock, before the stock Metropolitan sought after; the contrary, who transferred will be deleted constituent status of the stock is bound to suffer selling pressure until the news came to light, or officially announced so far.