Introduction Hanoi, January 2009 The entire world has just said good-bye to the year of 2008 with a heavy mood. Everyone welcomes the new spring with decisions of tightening expenditure to deal with the economic crisis evaluated as the biggest crisis since the industrial big slump in 1930s of last century. In 2008 securities index in our country reduced over 60% and average reduction in the world was 40%. Low economic yield and unemployment increase are popular situation in all countries, so the governments must issue the huge demand stimulating packages to save the economy. This economic...