A simple daily “buy the dip” switch: own SPY only when its price falls below its 5‑day average; otherwise sit in BIL (short‑term T‑bills). Broad U.S. stock exposure on dips, cash‑like safety the rest of the time.

Each day, it checks SPY (tracks the S&P 500). It calculates SPY’s 5‑day average price (the average of the last 5 closes). If today’s price is below that average (a short‑term dip), it puts 100% into SPY (broad U.S. stocks). Otherwise it parks 100% in BIL (short‑term U.S. T‑bills). Rebalanced daily.

Dip-based mean reversion: mostly short-term Treasuries, buys SPY on brief dips. Out-of-sample drawdown 13.8% vs SPY 18.8%; annualized return ~9.1% vs SPY 14.8%; Calmar ~0.66. Benefit: better downside protection with upside participation.