Derivative financial market risk caused by the excessive speculation should be prevented.

This paper discusses the active and inactive function in stock market,points out that there is the problem of excessive speculation in stock market of China,then poses the countermeasure constraining it.

The speculative activity in the stock marker can be diveded into normal speculation and excessive speculation.

Analysis of over-investment in generation capacity based on game theory;

In-debt Financing,Major Stockholder Control,and the Firms Over-investment Behavior;

The Identification of Over-investment of Listed Companies in China;

Analysis on the overinvestment behavior based on a real option

The authors find that there are indeed stylized facts of structural overinvestment in the transitional period of China.

Stock right can not effectively restrict overinvestment with either state-control or general social legal person.

We find that the strong cash flow sensitivities of investment spending are indeed associated with companies financing constraints or overinvestment.

This paper analyzes the overinvestment of China s listed enterprises which have the preferences of equity financing, basing on information asymmetries and divergences of stockholders objectives on the equity structure design.

Rent-seeking, Excessive Investment and Local Protection;

Research on The Relations Between Debt Constraints and Excessive Investment of Free Cash Flow

The root reason behind the decline is excessive investment and excessive competition, which is characterestic of the transitional economy.