Mean reversion of silver-gold ratio to historical norms
| Strategy Type | Relative Value / Spread Trading System |
| Market Outlook | Mean reversion of silver-gold ratio to historical norms |
| Risk Profile | Moderate - hedged exposure reduces directional risk |
| Reward Profile | Steady returns from ratio convergence |
| Time Horizon | Swing to Position (weeks to months) |
| Best Markets | Gold and silver futures, spot, or ETFs |
| Signal Type | Ratio extremes with mean reversion expectation |
| Market Hours | Both metals trade nearly 24 hours |
| Timeframe Recommendations | Major ratio trends and extremes • Primary trading signals • Entry timing refinement • Execution and short-term management |
| Australian Trading Advantages | Hedge exposure reduces directional risk • Ratio trades suit longer-term approach • Trade ratio 24 hours across sessions • GLD/SLV available on ASX via CDIs |
| Ratio Instruments | GC/SI or MGC/SIL - direct ratio exposure • XAUUSD/XAGUSD - CFD-based ratio • GLD/SLV - equity-based ratio exposure • Match contract sizes for proper hedge |
| Ratio Characteristics | Approximately 60:1 (varies by era) • 40:1 to 100:1 (since 1990) • Above 80:1 (silver cheap) • Below 50:1 (silver expensive) • Tends to return toward average over time |
| Australian Schedule | Sunday evening - ratio analysis • Morning - ratio level and momentum • US session for best liquidity • Daily review of spread |
No. Beginners can start by simply favoring the undervalued metal. When ratio is high (>80), favor silver when bullish on metals. When low (<50), favor gold. This is simpler than a full spread.
Ratio trades are longer-term, typically taking 2-12 weeks for the ratio to move meaningfully toward the mean. Some trades can extend to several months. Patience is required.
The modern historical average is approximately 60-70:1, though it varies by era. In recent years (2015-2024), the ratio has averaged closer to 75-80. Consider the current regime when setting expectations.
In a spread trade, you can lose if the wrong metal goes up more. If you're long silver/short gold and gold rises more than silver, you lose - even though both rose. That's the spread risk.
Beginners can use ETFs (GLD/SLV) or spot CFDs (XAUUSD/XAGUSD). More advanced traders use futures (GC/SI or MGC/SIL). Each has pros and cons regarding costs, margin, and execution.
Z-score = (Current Ratio - Mean) / Standard Deviation. Use a 200-day rolling window for both mean and std dev. A z-score of +2 means the ratio is 2 standard deviations above the mean.
Statistical extremes can extend significantly (e.g., 2020 ratio went to 125). Waiting for momentum confirmation (RSI divergence, MACD crossover) helps avoid entering too early and suffering large drawdowns.
Calculate equal dollar amounts for each leg. Example: $25,000 long silver ($25 price = 1,000 oz) and $25,000 short gold ($2,000 price = 12.5 oz). Match dollar exposure, not ounces.
Consider rebalancing when the legs become significantly unequal (10%+ divergence). This can happen as prices move. Monthly review or after significant moves is a reasonable frequency.
Futures offer better margin treatment for spreads and no borrowing costs, but require futures account. ETFs are accessible in regular brokerage but require margin for shorting and have borrowing costs.
Watch for the ratio breaking long-term ranges, spending extended time at new levels, and fundamental shifts (major demand changes). During transitions, widen parameters and reduce size until new regime establishes.
Options provide defined risk (max loss = premium). Buy calls on undervalued metal + puts on overvalued metal. Eliminates unlimited spread risk, but pay time decay. Use longer-dated options for ratio trades.
During stress, gold and silver can temporarily decorrelate (flight to gold). This can cause both legs to lose simultaneously. It's a reminder that spread trades aren't risk-free - just different risk profile.
Allocate ratio trades as part of overall alternatives/commodities sleeve (e.g., 10-20% of portfolio). The low correlation to equities provides diversification. Size based on total portfolio risk, not just metals allocation.
Dynamic regime-adjusted means, multi-timeframe analysis, options overlays for defined risk, calendar-based entry (avoiding key events), and correlation monitoring. Also, tracking multiple ratio pairs (gold/platinum, silver/platinum).
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