Growth Consensus Fragility
Copper–Gold Growth Divergence Tracker
A cross-asset audit of whether Treasury yields confirm a copper-versus-gold growth proxy built from publicly available data. Research-only. Independent.
Data as of: Apr 17, 2026 (last trading day) · Page updated: Apr 18, 2026
Cu/Au proxy: 1.25×10⁻³ · 10Y: 4.32% · GCDI: 69/100
This public edition uses derived observations from publicly available data. It does not display Yahoo Finance data, CME website data, or live LBMA Gold Price benchmark data.
QUICK ANSWER · AS OF Apr 17, 2026
What is the copper-gold ratio signaling in 2026?
The Growth Consensus Divergence Index (GCDI) is 69/100 (HIGH). The copper-gold ratio proxy (1.25×10⁻³ lb/oz) and the 10-year Treasury yield (4.32%) are in Yield-Led Divergence — their 60-day rolling correlation is 0.08, compared to a long-term historical average of approximately 0.85 (computed from 2000–2021 data, prior to the structural breakdown). A high reading means the bond market and the copper-gold proxy are not moving in a historically consistent way. GCDI measures the divergence itself; it does not, on its own, prove a single causal explanation. All values are derived from publicly available sources and are subject to revision.
GCDI Score
69/100 (HIGH)
Cu/Au Proxy
1.25×10⁻³
10Y Yield
4.32%
60D Correlation
0.08 (vs 0.85 baseline)
The relationship between the copper-gold ratio and Treasury yields has been less stable in recent years. GCDI is designed to detect that instability rather than assume permanent breakdown. Research interpretation follows measured divergence and is shown separately from the score.
GCDI 69/100 — Yield-Led Divergence: 10Y yield 74bps above Cu/Au-implied level. 60D correlation 0.08 vs historical 0.85 — structural instability persists.
Cu/Au Proxy
1.25×10⁻³
10Y Yield
4.32%
60D Corr
0.08
Direction
Yield-Led Divergence
What Is the Growth Consensus Divergence Index?
The Growth Consensus Divergence Index (GCDI) is a research indicator developed by AhaSignals Laboratory. In this public-data edition, it measures the divergence between:
- a copper-versus-gold growth proxy constructed from publicly available price data, and
- the 10-year U.S. Treasury yield.
Historically, growth-sensitive commodity pricing and long-term yields have often moved in the same broad direction with a correlation of approximately 0.85 (computed from 2000–2021 data). GCDI does not assume that relationship is fixed at all times. Instead, it measures when the relationship becomes unusually weak, unstable, or structurally inconsistent with its own trailing history. The relationship has been less stable in recent years, and GCDI is designed to detect that instability rather than assume permanent breakdown.
Core insight
When the growth proxy and Treasury yields stop confirming each other, the growth narrative becomes harder to trust. GCDI measures that fragility.
Key Metrics — Apr 17, 2026
Cu/Au Proxy Ratio
1.25×10⁻³
lb per oz
10Y Yield
4.32%
U.S. Treasury official
60D Correlation
0.08
vs 0.85 baseline
Model Gap
+74bps
actual vs model-implied
Divergence D
3.77σ
Yield-Led Divergence
GCDI Score
69/100
HIGH
GCDI Component Scores
Mild break — 60D correlation: 0.08 vs 3Y baseline: 0.85. Break magnitude: 0.77.
Extreme divergence — Z-score divergence D = 3.77σ (95th pct threshold: ±3.5σ).
Mild acceleration — 20D change in divergence: 0.67σ (threshold: ±1.5σ).
GCDI is a composite of three components, not solely determined by any single input. A higher D with a lower GCDI indicates that correlation or acceleration components are scoring lower.
Growth Confirmation Regime Map
Four-quadrant classification based on 20-day trailing simple change rate of the Cu/Au proxy ratio and 10Y yield. The current quadrant classifies confirmation versus divergence, not a single macro cause.
Cu/Au ↑ + 10Y ↑
Growth Confirmation
Growth improving; bond market confirms.
Cu/Au ↑ + 10Y ↓
Bond-Market Skepticism
Copper signals recovery; bonds price slowdown.
Cu/Au ↓ + 10Y ↑
Inflation / Fiscal Distortion
Growth proxy weakens; yields held up by non-growth factors.
Research classification: ← CURRENT
Cu/Au ↓ + 10Y ↓
Growth Slowdown Confirmation
Growth weakening; bond market confirms slowdown.
Research classification: Inflation / Fiscal Distortion
The copper-gold ratio is weakening (gold outpacing copper despite recent gold selloff) while Treasury yields remain elevated. This pattern is consistent with non-growth yield pressure and structural gold repricing. The bond market is not confirming a growth recovery; yields appear held up by factors beyond growth expectations.
Possible Breakdown Types (Interpretive Layer)
These categories are research hypotheses used to interpret a high GCDI reading. They are not direct outputs of the score itself. Evidence status for each type is ranked separately from GCDI.
Treasury yields may be elevated by factors other than growth expectations, including fiscal deficit supply pressure and term premium expansion.
Gold may be moving for reserve, defensive, or market-structure reasons not fully related to cyclical growth, including central bank reserve accumulation.
Copper may be influenced by sectoral demand or supply conditions beyond broad cyclical growth, including green-energy transition and AI infrastructure buildout.
The highest-signal case: the growth proxy and bond market are genuinely disagreeing about growth direction. Currently assessed as secondary to Type A+B structural distortions.
| Type | Yield Behavior | Cu/Au Behavior | Fragility Impact | Signal Value |
|---|---|---|---|---|
| A — Non-Growth Yield | ↑ supply-driven | → or ↓ | Medium | Yield signal may be polluted |
| B — Gold Distortion | Independent | ↓ gold-inflated | High | Cu/Au signal may be distorted |
| C — Copper Structural | Independent | ↑ non-growth demand | Medium | Cu signal noisy |
| D — True Growth | Contradicts Cu/Au | Diverges from yield | CRITICAL | Highest-value signal |
Historical Reference Episodes (Illustrative)
Reconstructed GCDI scores for key historical periods. These are illustrative case studies, not performance claims and not a trading backtest. Past patterns do not predict future outcomes.
| Period | 60D Corr | D (σ) | GCDI | Type | What Happened Next |
|---|---|---|---|---|---|
| 2006 Q4 | 0.78 | +0.3 | 18 NORMAL | None | Signals synchronized; pre-crisis calm before 2007–2008 breakdown. |
| 2008 Q3–Q4 | 0.62 | +0.9 | 38 ELEVATED | D | GFC; Cu/Au led downward; both signals eventually converged at lows. |
| 2013 Q2–Q3 | 0.11 | +2.1 | 72 HIGH | A | Rates reverted; fiscal/policy-driven spike; Cu/Au signal was correct. |
| 2018 Q4 | 0.45 | -0.5 | 44 ELEVATED | D | Growth slowdown confirmed; Fed pivoted; both signals converged lower. |
| 2020 Mar | 0.71 | -0.3 | 22 NORMAL | None | Synchronized panic; rapid V-shaped recovery in both signals. |
| 2021 Q1 | 0.80 | -0.4 | 15 NORMAL | None | Reflation sync; both signals confirmed growth recovery narrative. |
| 2022 H2 | -0.15 | +2.8 | 88 CRITICAL | A+B | Historic structural breakdown begins; fiscal + gold distortions dominate. |
| 2023 Q3 | -0.22 | +3.1 | 91 CRITICAL | A+B | Peak structural divergence; yields eventually pulled back from 5%. |
| 2024 Q2 | 0.08 | +2.4 | 82 CRITICAL | A+B+C | Sustained breakdown; copper green-energy demand adds Type C distortion. |
| 2025 Q4 | 0.12 | +2.2 | 78 CRITICAL | B | Gold repricing era; gold hits new highs; Cu/Au ratio suppressed. |
| 2026 Mar (current) | 0.08 | +3.8 | 69 LIVE | A+B | Current — gold experienced steepest weekly drop since 1983; monitoring for convergence or further breakdown. |
GCDI is a composite of three components, not solely determined by D. A higher D with a lower GCDI indicates that correlation or acceleration components are scoring lower in the current period.
How GCDI Connects to Other AhaSignals Tools
GCDI is the growth-axis proxy tracker in AhaSignals' multi-dimensional consensus fragility system. Shared variables across tools do not imply shared licensed source data on this page. This public edition is built only from publicly available data.
Pairwise Cross-Tool Signals
| GCDI × | Both LOW | GCDI HIGH, Other LOW | Both HIGH |
|---|---|---|---|
| GODI | Macro Coherence | Growth Crack | Gold Regime Shift |
| TOCI | Yield Coherence | Yield Overpricing Growth | Yield Trap |
| TYFI | Rate Consensus Intact | Price-Driven Fragility | Yield Consensus Collapse |
Haven vs inflation tension
Gold is the shared variable. When GCDI and GODI are both CRITICAL, gold has decoupled from traditional commodity relationships — both Cu/Au and Au/Oil are distorted. This "Gold Regime Shift" signal means gold may be repricing as a monetary reserve asset.
Yield vs oil-inflation tension
When GCDI and TOCI are both HIGH, 10Y yields are questioned by both growth (Cu/Au) and inflation (oil) signals — a "Yield Trap" where any directional adjustment may be violent.
Rates consensus fragility
GCDI measures growth-price fragility; TYFI measures forecast-consensus fragility. When both are CRITICAL, 10Y yield has lost both its price anchor and its forecast anchor.
Gold consensus fragility
When GFI is HIGH and GCDI is CRITICAL, the gold component of Cu/Au may be distorted by speculative positioning — Type B risk increases.
Equity concentration fragility
When ACRI is CRITICAL and GCDI is CRITICAL, both equity and growth narratives are structurally vulnerable simultaneously.
EUR/USD consensus divergence
Dollar dynamics affect both gold pricing and yield levels. DCDI helps contextualize whether GCDI divergence is dollar-driven.
Triple-Critical Signal (research observation)
When GCDI ≥ 75 + GFI ≥ 70 + ACRI ≥ 80 simultaneously, multiple consensus systems are structurally fragile. This combination has historically preceded significant macro regime transitions. It is a research observation, not a trading signal.
Methodology
GCDI Calculation — v1.0 (click to expand)
Layer 1: Correlation Breakdown (weight 35%)
ρ(t) = Pearson Corr[ Cu/Au(t-60:t), 10Y_Yield(t-60:t) ] CorrBreakScore = clamp( |ρ(t) - 0.85| / 1.85 × 100 ) +10 bonus if sign flips (negative correlation) Baseline 0.85 computed from 2000–2021 data (pre-structural-breakdown period)
Layer 2: Divergence Magnitude (weight 45%)
Z_CuAu(t) = ( CuAu(t) − μ_CuAu ) / σ_CuAu [3Y rolling] Z_10Y(t) = ( 10Y(t) − μ_10Y ) / σ_10Y [3Y rolling] D(t) = Z_10Y(t) − Z_CuAu(t) DivMagScore = clamp( |D(t)| / D_95pct × 100 ) D_95pct ≈ 3.5σ (computed from 2000 to latest full calendar year, recalibrated annually)
Layer 3: Divergence Acceleration (weight 20%)
ΔD(t) = |D(t) − D(t-20d)| DivAccScore = clamp( ΔD(t) / ΔD_95pct × 100 ) ΔD_95pct ≈ 1.5σ (computed from 2000 to latest full calendar year, recalibrated annually) "20-day trailing direction" = sign of 20-day simple change rate
Composite
GCDI = 0.35 × CorrBreakScore + 0.45 × DivMagScore + 0.20 × DivAccScore
Score Interpretation
0–25
NORMAL
26–50
ELEVATED
51–75
HIGH
76–100
CRITICAL
Signal Limitations:
Cu/Au is not a pure growth proxy — it is also affected by USD movements, copper inventory cycles, and green-energy structural demand (Type C). Gold pricing has been increasingly influenced by central bank reserve accumulation (Type B), which may distort the Cu/Au ratio's traditional growth-signal interpretation. 10Y yield embeds inflation expectations, term premium, and fiscal supply in addition to growth expectations (Type A). GCDI measures the fragility of their statistical relationship, not the direction of either signal.
Data Limitations:
This public edition uses derived analytical observations from publicly available data. Copper and gold price observations reflect end-of-day settlement values and may be subject to delays of one or more trading days. The 10-Year Treasury yield represents the constant maturity rate from the U.S. Treasury's official daily yield curve. All input data is subject to revision by the original data providers.
Methodology Limitations:
The 0.85 correlation baseline is computed from 2000–2021 data (pre-structural-breakdown period). The D_95pct threshold (approximately 3.5σ) and ΔD_95pct threshold (approximately 1.5σ) are computed from 2000 to the most recent full calendar year and are recalibrated annually. The GCDI composite score is a weighted sum of three components and is sensitive to the choice of rolling windows (60-day primary, 3-year Z-score normalization) and weight allocation (35%/45%/20%). These parameter choices represent research judgment and are not optimized to historical outcomes.
Computation Status:
GCDI is computed using an automated data pipeline that runs daily after U.S. market close. If the pipeline fails to retrieve fresh data, the page will display a data staleness warning. The "Data as of" timestamp reflects the most recent trading day for which all inputs were successfully retrieved and validated.
Data Sources & Usage Rights
| Data | Source | Cadence | As Of |
|---|---|---|---|
| Copper price observation | Derived from publicly available end-of-day settlement data. AhaSignals does not redistribute exchange market data. | End of day | Apr 17, 2026 |
| Gold price observation | Derived from publicly available market data. AhaSignals does not redistribute LBMA Gold Price benchmark data or exchange quotes. | Daily | Apr 17, 2026 |
| 10Y Treasury yield | U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates (public domain). | Daily | Apr 17, 2026 |
| 10Y Breakeven | Derived from Treasury nominal and TIPS yields (public government data). | Daily | Apr 17, 2026 |
Not used on this public page: Yahoo Finance data · CME website market data · Live LBMA Gold Price benchmark data
DISCLAIMER
GCDI is a research indicator developed by AhaSignals Laboratory for educational and analytical purposes only. It does not constitute investment advice, a recommendation, or a solicitation to buy or sell any security.
DATA SOURCES AND ATTRIBUTION
10-Year Treasury Yield: U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates. Public domain data available at treasury.gov.
Copper and Gold Price Observations: AhaSignals derives copper and gold price observations from publicly available data for the sole purpose of computing derived analytical indicators (Cu/Au ratio, Z-scores, GCDI scores). AhaSignals is not a licensed distributor of CME Group market data and does not redistribute real-time or delayed CME Group Information as defined under the CME Group Information License Agreement. AhaSignals does not redistribute Yahoo Finance data. AhaSignals does not hold a redistribution license from ICE Benchmark Administration (IBA) and does not redistribute the LBMA Gold Price benchmark.
NO ENDORSEMENT
AhaSignals is not affiliated with, endorsed by, or sponsored by the U.S. Department of the Treasury, the Federal Reserve Bank of St. Louis, FRED, ICE Benchmark Administration, the LBMA, CME Group, Yahoo Finance, or any data provider referenced herein. The use of data from publicly available sources does not imply any endorsement of AhaSignals or its research products.
LIMITATION
GCDI measures the statistical relationship between derived price observations. It does not predict market direction. Past divergence patterns do not guarantee future outcomes. All computed scores, correlations, and classifications are model outputs subject to data input quality, methodology assumptions, and computational limitations. Interpretive labels (breakdown types, regime classifications) are research hypotheses displayed separately from the measured score.
Frequently Asked Questions
What is the copper-gold ratio?
The copper-gold ratio (Cu/Au) divides the copper price by the gold price. Copper reflects industrial demand and growth expectations; gold reflects safe-haven demand and monetary credibility. The ratio isolates growth sentiment by dividing "demand" by "fear." Historically, it correlates with 10-year Treasury yields at approximately 0.85 — both respond to expected real GDP growth.
What is the current copper-gold ratio proxy in 2026?
The copper-gold ratio proxy is currently 1.25×10⁻³ lb/oz. This ratio has been structurally suppressed in recent years. The 60-day correlation with 10Y Treasury yields is 0.08, far below the historical baseline of 0.85 (computed from 2000–2021 data).
What is the Growth Consensus Divergence Index (GCDI)?
GCDI measures how much a copper-versus-gold growth proxy and the 10-year U.S. Treasury yield disagree about economic growth. Rather than predicting which signal is correct, it treats the divergence as a fragility indicator for the market's growth consensus. Developed by AhaSignals Laboratory. Current score: 69/100 (HIGH).
Why does the copper-gold ratio matter for economic growth?
The copper-gold ratio has historically been one of the strongest leading indicators for the 10-year U.S. Treasury yield, with a correlation of approximately 0.85 over the 2000–2021 period. When the ratio rises, it signals industrial confidence and growth expectations — which typically push bond yields higher. When it falls, it signals defensive positioning.
Why has the copper-gold ratio become less correlated with Treasury yields since 2022?
Three structural shifts may be contributing: (1) non-growth yield pressure from fiscal deficits and term premium expansion (Type A), (2) gold repricing driven by central bank reserve accumulation and geopolitical hedging (Type B), and (3) copper's evolving role in green energy and AI infrastructure creating non-cyclical demand (Type C). These are research hypotheses, not proven causal explanations.
How often is GCDI updated and where does the data come from?
GCDI is computed daily using an automated pipeline that runs after U.S. market close. The 10-year Treasury yield is sourced from the U.S. Treasury's official daily yield curve data (public domain). Copper and gold price observations are derived from publicly available settlement data. All computed values (GCDI score, correlation, Z-scores) are AhaSignals' own derived calculations. AhaSignals does not redistribute raw price data from any exchange or benchmark administrator. If the pipeline fails to retrieve current data, the page displays a staleness warning. Data may be delayed by one or more trading days.
Is the copper-gold ratio still a reliable growth indicator in 2026?
The traditional correlation has weakened from ~0.85 to near zero. AhaSignals argues the divergence itself is now the more informative signal. GCDI explicitly measures how fragile the growth consensus is by quantifying the breakdown — rather than asking "who is right," it asks "how vulnerable is the disagreement."
What is a "Yield-Led Divergence" vs "Growth-Led Divergence"?
Yield-Led means Treasury yields are above what the Cu/Au ratio implies — consistent with non-growth yield pressure or inflation overshoot. Growth-Led means Cu/Au is above what yields suggest — industrial demand recovering but not yet confirmed by the bond market.
What are the GCDI breakdown types (A/B/C/D)?
These are interpretive categories, not direct model outputs. Type A: non-growth yield pressure. Type B: precious-metals-specific gold distortion. Type C: copper-specific structural demand shifts. Type D: true growth signal divergence — the highest-value signal when the growth proxy and yields genuinely disagree about growth trajectory.
How is GCDI different from just watching the copper-gold ratio?
Traditional analysis uses Cu/Au to predict yield direction. GCDI measures the gap between them as a consensus fragility indicator. It does not forecast who is right — it measures how vulnerable the prevailing growth narrative is to rapid adjustment.
How does GCDI connect to other AhaSignals tools?
GCDI measures growth consensus fragility. GFI measures gold consensus fragility. ACRI measures equity concentration risk. TOCI measures yield-oil inflation tension. Together they form AhaSignals' multi-dimensional consensus fragility measurement system.
How does GCDI interact with GODI, TOCI, and TYFI?
GCDI uses Cu/Au vs 10Y yield to measure growth consensus. GODI (Gold-Oil Divergence) uses Au/Oil to measure haven vs inflation tension. TOCI (Treasury-Oil Crosswind) measures yield vs oil-price inflation transmission. TYFI (10Y Yield Fragility) measures rate forecast consensus crowding. Gold is the shared variable between GCDI and GODI; 10Y yield is shared between GCDI, TOCI, and TYFI. When multiple tools are simultaneously at HIGH or CRITICAL, cross-asset consensus is structurally fragile.
What is a "Yield Trap" in the GCDI framework?
A Yield Trap occurs when both GCDI and TOCI are at HIGH or CRITICAL simultaneously — meaning 10Y Treasury yields are being questioned by both the growth signal (Cu/Au) and the inflation signal (oil). The yield level is neither justified by growth nor accurately reflecting inflation, making any directional adjustment potentially violent. This is a precursor to elevated rate volatility.
What should I do when GCDI is CRITICAL?
GCDI is a research tool, not investment advice. A CRITICAL reading means growth consensus is structurally contradictory — historically associated with elevated probability of macro regime transitions within 60–90 days. See the methodology section for interpretation guidance.
Does this page show live copper or gold prices?
No. This public edition uses derived analytical observations from publicly available data rather than live exchange quotes or benchmark settlement prices. AhaSignals does not redistribute CME Group market data, Yahoo Finance data, or LBMA Gold Price benchmark data.
📎 Cite This Research ▾
If citing GCDI methodology and analysis:
AhaSignals. (2026). Growth Consensus Divergence Index (GCDI): Copper-Gold Ratio × 10Y Treasury Yield Tracker. Retrieved Apr 18, 2026, from https://ahasignals.com/copper-gold-ratio-tracker/
If citing underlying data, please cite the original sources directly:
U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates, https://home.treasury.gov/resource-center/data-chart-center/interest-rates/.
Methodology: v1.0
Data as-of: Apr 17, 2026
AhaSignals computes derived analytical indicators (GCDI scores, correlations, Z-scores) from publicly available source data. The derived indicators are AhaSignals intellectual property. The underlying price data belongs to its respective owners.
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