国际经济研究院院长伯格斯坦最近提出，全球经济存在四大风险，它们包括：美国贸易逆差、欧洲经济硬着陆的风险、油价高涨及日本局势的不安定。他解释说，美国经济虽然很强劲，但贸易失衡的情况依然严重，目前年度贸易逆差高达4，000亿美元，占国内生产总值的4％以上。虽然美元 Bergstein, president of the Institute of International Economics, recently said that there are four major risks in the global economy: the U.S. trade deficit, the risk of a hard landing in Europe, rising oil prices and the instability in Japan. He explained that although the United States economy is very strong, the trade imbalances are still grave. The annual trade deficit is as high as 400 billion U.S. dollars, accounting for more than 4% of the GDP. Although the dollar