I love this idea of adding a recession flag to a trend following system. I’ve studied trend following off and on before, but no matter how I tweaked the system, the more accurately I accounted for real-life slippage like price gaps causing bad stop executions, the worse it underperformed buy & hold. The drawdown & risk/reward were better since you could always count on dodging the bears, but you got nibbled to death by whipsaw ducks much of the rest of the time. As long as the recession warnings are reasonably accurate, this will let you avoid the ducks and still dodge the bears.
And I recently realized there’s another benefit to the reliable bear-avoidance of trend following that I haven’t seen mentioned anywhere before: if you know you’re safe from bears, then you don’t need any stinking bonds. Especially with the lousy bond returns these days, getting rid of bonds alone should boost your portfolio returns way more than any trend following losses. That alone is probably enough to make even full-time trend following outperform buy & hold. Time for me to run some more simulations.