In March, we witnessed a bank from the sale of its assets to bankruptcy only takes 48 hours, and we also saw that it takes only one weekend for the risk to spread from the United States to Europe. A globally systemically important bank like $Credit Suisse Group AG(CS)$ has been severely impacted, and the liquidity position is likely to escalate to a credit crisis.After these accidents, global central banks shows clear attitude: risk prevention is the highest priority!The U.S. Treasury Department, the Fed, the Swiss National Bank, and the European Central Bank have all stated that they can save, must save, and to save as soon as possible.It is clear that the cost of rescuing the bank in trouble is indeed low, otherwise the serial bank runs will cause