run multiple uncorrelated systems or just perfect one
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ive got one decent mechanical system working and im debating whether to deepen it or build a second, uncorrelated one to smooth the equity curve. diversification across systems sounds smart but it also doubles the maintenance and the ways things can go wrong. for systematic traders, is multiple uncorrelated systems genuinely better, or is one well-understood system the wiser path?
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multiple genuinely uncorrelated systems is the textbook win because their drawdowns offset and the combined equity curve is smoother than either alone. the catch is in the word genuinely. most retail traders second system is just their first one in a slightly different costume, correlated under the hood, so they double the maintenance for no real diversification. one well-understood system beats two secretly-correlated ones. only add a second if you can demonstrate low correlation, not assume it.
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the hidden-correlation trap is the whole issue. two trend-following systems on correlated pairs will draw down together exactly when you hoped one would cover the other. real diversification needs different logic, ideally one that profits in conditions the other struggles in, like a trend system paired with a mean-reversion one. if both win and lose at the same times, youve added work and risk concentration disguised as diversification.
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most people asking this havent fully mastered the one system they already have, and a second is just a fresh way to be mediocre at two things. perfecting one you deeply understand beats babysitting two you half understand. the urge for a second system is often boredom with the first, not a portfolio strategy.
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the troll is right for most people at most stages. the honest sequencing: master and trust one system completely first, accumulate enough live data to truly understand its behaviour, and only then add a second one whose logic is demonstrably different and whose correlation to the first you have actually measured. adding a second system to escape boredom or to paper over an incompletely understood first one is how people end up running two things badly. earn the second system, dont reach for it.
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master one first, add a second only with measured low correlation, not vibes.
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