World GDP is equal to roughly $80 trillion in nominal terms. One-quarter comes from the US, another quarter comes from Western Europe (about 20 countries) and Canada, another quarter comes from China (about 60% as big as the US), Japan (the world’s third largest economy), South Korea (11^th) and Philippines (36^Th). The final quarter comes from the remaining 169 nations including the smallest nation, Tuvalu with GDP of $38 million.