Under the coordinated action by central banks in the U.S., Canada, Japan, Switzerland and the ECB, the U.S. Federal Reserve lends dollars to the ECB, getting euros in return, and the ECB in turn provides European banks with the U.S. dollars. The European banks were facing a shortage of U.S. dollars in November 2011. Money market funds in the U.S. had pulled back from investing in eurozone bonds in the third quarter of 2011, adding to the shortage of dollars. This action eases liquidity concerns.