The dollar falls when US citizens demand foreign currency to buy Olympic wrestling tickets, for example. When interest rates are higher abroad, US citizens demand British Pounds and supply US Dollars. This causes the value of the dollar to drop. This is understandable since US interest rates are low. The Fed's role is to stablize the US economy with its monetary tools like open market operations and discount rate. Seems like nothing is going to stop the feel falling dollar for long as the cartoon suggests.