On the stock market, real symmetric information is really not fair dealing, the subject is much more information will definitely benefit decisions for myself than others. Mishkin (2004) used the theory of reverse selection issues to explain the behavior of buying and selling on the stock market under impacts of real symmetric information. According to the author, the market will have good stock is the stock have large expectations profits and low risk, and bad stock is stock profit expectations low and high risk. For any symmetry of information makes the price that ordinary investors willing to buy would be the average price between the value of the stock of good and bad. The owner or Manager of the company good will get better information and investors know that the price of stocks on the market are being priced low and therefore will not sell the stock holding for investors in the average price. So often investors can only buy the bad stocks. But in contrast, ordinary investors is also a rationalist, he won't want the bad stocks and the decision will not trade. The ultimate consequences of bringing is has fewer companies sold shares on the market and therefore can not finance, the stock market cannot grow to become one of the key sources for the economy as policy makers expected.
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