The US has a common currency among its 50 states, but it also has a funds-transfer system to avoid the imbalances like those currently threatening Europe. Last year, 28 US states sent part of their gross domestic product to the other 22 states through the federal budget. The biggest contributor, Delaware, sent 21 percent of its GDP; the biggest recipient, North Dakota, received 71 percent of its GDP from the federal budget. In contrast, the most prosperous member of the EU, Germany, contributed just 0.2 percent of its GDP to the EU budget, while Greece, at the bottom, received approximately the same amount. Would Germany be willing to do what Delaware does and contribute 100 times more than it does now? Unlikely.