Also think about how money is moved:
- on risk/off risk
- between currency, commodities and bonds i.e. USD vs GOLD, USD vs T-Bonds etc...
- Oil is too volatile for my test, and less liquid.
Also the more currencies you trade the more margin you're likely to use up... and if you get stuck in a hedge with high DD and not enough margin to work your way out... you'll just have to take the loss and start over or put in more money...
No need to go overboard... attached is a little factsheet I created for a source
Peter