Freshwater or Saltwater?
Smith or Keynes? Free market or government fine-tuning?
If you are the latter, you can say you are a saltwater economist. A recent article from Paul Krugman (NY TIMES MAGAZINE; 9/06/09) characterizes the economists who reside along either coast as saltwater. By contrast, those near the Great Lakes (University of Chicago), near freshwater, can be called the classical/Adam Smith crowd.
However, not everyone agrees: