Quote from auspiv:
my short little experience with spread trading indicies basically came down to this conclusion: on up trending days, buy the higher volatility index and short the lower one, for example buy tf sell ym. i quickly realized it was a circular relationship in that if i could identify the trending days i wouldn't need to be doing spread trades anyways.
the other way to look at it is after a large run-up (you feel the market is overbought and want a pullback) sell the higher vol and buy the lower vol, but this goes right back to the circular relationship.
In my limited experience of it, spread trading is not much easier or safer than outright positions trading, for the reasons you point out. There is only as much profit potential as there is loss potential, and predicting the future of the market is never easy, whether trading spreads or outright positions. The notable claim of spread trading, however, is that spread markets trend better (that is, stronger, longer, and with less variance) than outright positions. If that is the case, than yes, spread trading is the way to go. I have yet to ascertain whether the claim of superior trendability is valid. Any comments to this point would be valued. As for the trading methodology, your ideas seem good and I'm going to keep them in mind in my own spread trading. I usually do something a little different: I just buy the stronger of two related markets and short the weaker one. Simply illustrated, if corn were trending higher and wheat were flat, I'd go long corn and short wheat. That flies exactly in the face of the statistical arbitrage (mean reversion) approach, but seems to work well in the short term. What do you folks all think?