摘要：Nowadays,the volatility of the stock market is high and many companies appear and disappear from the stock market. There are a number of reasons why the business entities disappear from the marketplace. They may be acquired by another company,liquidated,or affected by the global financial crisis (Franklin et al.,2007). For example,the global financial crisis has caused the downfall and casualties of some well-known and trusted financial institutions,such as Lehman’s Brothers and Union Bank of Switzerland in the Western World.
