All theses reflect on the stock price index, causing it to up and down.

这一切都反映在股票价格指数上，导致股票价格指数一度表现出大起大落。

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The stock price index is the "barometer" of national economy whose general trend of fluctuation and economic growth is generally in sync.

股价指数是国民经济的“晴雨表”，其波动与经济增长的总体趋势同步。

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The second part : The methods of stock price index forecast inland and abroad introduce a lot of methods to forecast the stock price index and have an analysis.

第二部分“国内外股票价格指数预测方法”介绍了目前国内外对股票价格指数预测的方法研究，并对各方法进行简要的评价；

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In essence, this collapse in stock prices -the one-day collapse in stock prices -I think in the U.S. The price was, depending on which index you were looking at, were down 21-22% in a single day.

实际上,这次股价暴跌,股价一天内的跌幅,当然在美国国内,要看你参考的是哪种股指,但基本上一天之内暴跌21-22%

耶鲁公开课 - 金融市场课程节选

Indexed options work similarly to traditional stock options, with one exception: Rather than having the exercise price fixed at the market price on the date of grant, the exercise price varies based on the change in an appropriate stock market index, e.g.

FORBES: How To Salvage Stock Options

The stock price used here is the Morgan Stanley World Index, which tracks 1, 869 stocks in the world's developed markets.

FORBES: Magazine Article

Best deployed when moderately bearish and one is looking to make a return on the small decline in the price of an index or stock.

FORBES: Optional Opportunity