asia is one of the world's most dynamic, and offers multiple opportunities for businesses and investors, in terms of its nominal groww domestic product GDP in 2005, japan had the largest economy 4.80 trillion,followed by china 1.84 trillion and korea.72 trillion china's real purchasing power exceeds 7 trillion.japan's is estimated at 4 trillion and korea's is estimated at 1 trillion. these giants' combined purchasing power is comparable to the 12 trillion u.s. economy.