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Content: It can also be argued that the single currency works for the USA because the US dollar is a hegemonic currency. Before the euro, eighty per cent of the world's currency reserves were held in US dollars. This gives the US economy a huge subsidy in that reserve dollars are invested in US institutions or foreign institutions under US control. This subsidy helps cushion the effects of a possible strong dollar hurting certain regions of the USA. If the euro were to become either a hegemonic currency replacing the dollar or a co-hegemonic currency equal in reserve status to the dollar, some of the subsidy the USA gains would be transferred to the EU and help balance out some of the problems of the present heterogeneous economic structure still in place. It has been said that the euro would add great liquidity to the financial markets in Europe. Governments and companies can now borrow money in euros instead of their local currency, and this would allow access to many more sources of funds. Other economists consider that the potential strength of the Eurozone would be in the coherent efforts of a virtual greater super-economy, in which it is now potentially easier to create stronger financial associations, rather than in the mere sum of single liquidities. Part of the euro's strength in the period 2001-2004 was thought to be due to more attractive interest rates in Europe than in the United States. The US Federal Reserve has had maintained lower rates than the ECB for some years, despite key European economies, notably Germany, growing relatively slowly or not at all.