The trading volume , acting as a proxy of information flow , conveys a kind of price signal , therefore , it is very necessary to study the stock market volatility from the trading volume , moreover , the chinese stock market having been deviation from the macro - economics in recent years strengthen the necessity of studying stock market volatility from the market micro - structure theory 而交易量作为一种信息代理指标，传达着一种价格信号，所以从交易量角度来研究股票市场波动性是特别有必要的。而近年来我国股票市场走势与宏观经济走势的背离，也进一步说明了从市场微观结构角度和信息角度来研究我国股票市场波动性的必要性。
In the early electric market in china , in order to encourage the power plant to supply reactive power and maintain the safe and stable operation of power system as well as give proper pricing signal of reactive power , the old method in which only active power is charged and reactive power is free must be changed 为调动发电厂参与无功辅助服务的积极性,确保系统安全稳定运行,并给无功电源建设以正确的价格信号,根据发电厂无功辅助服务成本分析和我国初级电力市场的状况,讨论了一种无功容量电价加无功电量电价的二部制无功辅助服务补偿电价。
