Bennett Pope, Chapter 11, question 6

In this chapter I learned a lot about the connections between the currencies of different nations around the world, but I was left wondering to what extent different countries affect others. For example, the world is going to notice a much larger difference if the U.S Dollar changes in value than the Guatemalan Quetzal. I would be interested to know what countries have the greatest impact and how much of an impact they have. The world impact of the Great Recession has been talked about, but what about on a smaller scale? Does the world primarily worry about the US? China? The Middle East? I am curious to know more.