"US imperialism continues to reveal its long-term vulnerability. The US now has a net investment liability with other economies in the world to the tune of 9.8% of world GDP.  This compares with countries which are net creditors: Japan (3.9%), Northern Europe (6.4%) and China (2.3%).  This US net liability measures the stock of investment and the amount of credit made by other countries into the US after deducting US investment and loans abroad.  US imperialism is extracting more net value from other economies to fund its growth, but at the expense of becoming more dependent on ‘tribute’ rather than trade.  The IMF forecasts that the US net liability to foreigners will reach 50% of its GDP by 2023, or 10.7% of world GDP.  That compares with the combined liability of the exploited peripheral economies of the world of 7.8%.  US imperialism gets away this because it is still the world’s largest economy, with the biggest financial sector, with the dollar as the world reserve currency and is the policeman of the world for imperialism."

— Michael Roberts