On February 27, 2007, the Shanghai and Shenzhen stock markets suffered a "Black Tuesday" and fell to an intraday limit. The Shanghai and Shenzhen stock markets plunged 8%, the biggest drop in the current stock market, and more than 700 stocks closed at the daily limit. The Shanghai Composite Index fell 268 points, or 8.8%. The Shenzhen Component Index fell 797 points, or more than 9%. More than 1.300 stocks in the two cities fell, with a turnover of about 200 billion yuan.

On August 20, 2007, the Shanghai Composite Index closed at 4,906.00 points, up 5.33% and down 4,458.40 points to 4,904.85 points.

Fluctuation is the description of fluctuation value, expressed in%, fluctuation = fluctuation value/yesterday's closing * 100%. The value generated by comparing the latest closing price (or closing price) of the current trading day with the closing price of the previous trading day. This value is usually expressed as a percentage. In China, the stock market is limited by the daily limit, so there is the word "daily limit".

Extended data:

The extent of the decline corresponds to the increase, which is a description of the rise and fall value, expressed in%, and the rise and fall = the rise and fall value/yesterday's closing * 100%. Such as price, stock market, etc.

Decline = (current price-closing price of the last trading day)/closing price of the last trading day * 100%. If it is negative, it is a decline; If the result is positive, it is an increase.

Example: A shares plunged on 26th, and the Shanghai and Shenzhen stock indexes recorded declines of over 7% and 8% respectively. The GEM index fell below the integer of 3,000 points, the biggest one-day drop in history of nearly 9%.