金融留学生作业代写of domestic credit.However,the credit bubble will inevitably burst one day,and the outbreak of the sub-prime crisis is caused by the excessive expansion of credit.The United States leads the global wave of financial liberalization under dollar standard.Excessive financial innovation is one of the most direct results caused by financial liberalization.In the stimulation of excessive financial innovation,sub-prime and related financial derivatives are created rapidly and constantly multiplied.When secondary housing credit assets which are the origin of these innovative products arising problem,market built on the basis of the financial derivatives collapsed down like castles in the air.The United States has taken a long-term low interest rate policy,which is rooted in the dollar standard,as well as the special return mechanism of the dollar standard.Fourthly,the imbalance of the U.S.economic structure under dollar standard caused the financial crisis.Although there are many explanations to the serious imbalance of the U.S. economy structure,the author believes that the structural imbalance of the U.S. economy is most profoundly rooted in dollar standard.Therefore,if we say that the serious imbalance of the U.S.economy structure is the incentive of the U.S.financial crisis,then,dollar standard is the source of the outbreak of the U.S.financial crisis.It is just because of dollar standard that has caused over-consumption and long-term“double deficit”in the United States,and also led to“de-industrialization”and economic over-virtualization.However,regardless of over-consumption or“double deficits”under dollar standard,eventually it will be difficult to maintain.When this situation can not be maintained for long,the occurrence of the crisis is inevitable. Similarly,there is serious imbalance between real economy and virtual economy,and over-virtualization of the real economy also contains huge financial risks.When such risk is accumulated to certain degree,it is difficult to avoid the outbreak of the financial crisis.More and more modern financial crisis is contagious in the international arena. Under dollar standard,the international contagion of the U.S.financial crisis has its own unique characteristics.Under the different monetary standard,financial crisis has different contagion characteristics.Specifically,under gold standard and Bretton Woods monetary system,international contagion of financial crisis is reflected in the regional or global deflation.Based on the dollar standard,as a result of long-term floating interest rates,unsound adjustment mechanism of international balance of payments,as well as the existence of U.S.hegemony,the occurrence of financial crisis,transmission frequency and speed are accelerating,especially in the 1990s,the financial crisis was becoming more frequent and increasingly widespread.Moreover, under dollar standard,international contagion of the U.S.financial crisis shows a economic phenomenon of“United States coughs,the world catch a cold”.Under dollar standard,with the economic strength of the United States itself,the U.S. financial crisis,mainly through currency issuance,depreciation of the dollar,bulk commodity prices rising,global inflation,the diminution in value of bond investments, psychological expectations etc.,passed on to the world.