I took Econ as a minor at University and although it was pretty cool to read about macroeconomics, the money supply, balance of international payments, swaps, bank rates, etc... I found that it is only applicable in the long run. Even the textbooks will say that it is a long run view. So IMHO, it isn't very useful to know for trading unless you are investing on that time scale.
It is a good read if only for personal knowledge, but the most applicable Econ concept that I found for trading is the micro section on supply and demand and how/why prices move. Also, the affect of price celings/floors and intervention is insightful for the FX market, and to a lesser degree on MM's decision to put heavy support or resistance at a key whole number level.
DNAJ65000