I am indebted to the blogger at Philosophical Economics who suggested a macro overlay to trend following systems (see Building the ultimate market timing model). Major bear markets generally occur under recessionary conditions. Why not ignore moving average signals until your macro model is forecasting a recession?Little did I expect the market to fall so dramatically after that sell signal, but I can't ask for much more in an asset allocation model, either on an intermediate or long term perspective.
This “Ultimate Market Timing Model” is ultimately beneficial for long-term investors. If you could cut off the left tail of the return distribution and avoid the really ugly losses, you could run a slightly more aggressive asset mix and receive a higher expected return with lower risk. For example, if the standard risk-return analysis dictates a 60% stock and 40% bond asset mix, you could change it to a 70/30 mix with this model, and get downside risk similar to the 60/40 portfolio. To be sure, this system isn’t perfect, and anyone using such a model will have to incur “normal” equity risk, and it would not have kept you out of the market in the 1987 Crash.