Golden Cross & Death Cross — Base Rates

The definitions

Golden cross: the 50-day SMA crosses ABOVE the 200-day SMA — intermediate momentum overtaking the long-term trend. Death cross: the reverse. These are slow, deliberate signals: by the time they fire, the move is months old. Their value is not earliness — it is REliability at filtering noise: they fire rarely and mostly mark regime changes.

The honest base rates

Backtests show golden crosses are followed by above-average returns ON AVERAGE — but with huge variance and many failures (whipsaws in sideways markets, and the cross often fires near the END of a move: the 2020 death cross in March preceded one of the great rallies). The cross is a regime CONTEXT tool: "the long-term trend has flipped" — it is a lens for interpreting everything else, not a trade trigger.

How pros use it

As a filter: only take long setups above a rising 200-day; treat golden-cross periods as "risk-on regimes" where pullback-buying works. The cross itself is information about the ENVIRONMENT, and environment determines which strategies are allowed to fire.

Sources

• Golden CrossInvestopedia
• Technical Analysis of the Financial MarketsJohn Murphy