A simple “buy the dip” system on Apple, Microsoft, and Amazon: if a stock is below its 50‑day average, own it; otherwise hold BIL (a cash‑like T‑bill ETF). Equal-weight across the three slots, rebalanced daily.

Each day, the portfolio looks at Apple, Microsoft, and Amazon. For each one, it compares today’s price to its average over the last 50 trading days (a simple “typical recent price”). If today’s price is lower, it buys that stock; if not, it parks that slice in BIL, a short‑term U.S. Treasury bill ETF. The three slices are equal-sized and the check happens daily.

Rule-based buy-the-dip on AAPL/MSFT/AMZN with a cash sleeve (BIL). OOS: 12.1% return, Sharpe ~0.60, Calmar ~0.69, beta ~1, 259 days. Diversifies risk and offers positive risk-adjusted return vs the S&P 500, though may lag in bull markets.