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Predicting Bond Yields with Copper-to-Gold Ratio

The relationship between the copper-to-gold ratio and the 10-year US Treasury yield has been extensively studied due to its predictive potential for yields. This relationship stems from the distinct characteristics of copper and gold in response to the business cycle.

Copper, being an industrial metal, experiences price fluctuations closely tied to the business cycle. During an expansionary phase, copper prices increase alongside inflation, which subsequently leads to higher bond yields. Thus, a direct relationship exists between copper and bond yields.

Conversely, gold exhibits an inverse relationship with bond yields. During periods of economic distress, investors flock to safe-haven assets such as gold and bonds. This surge in demand for gold and bonds causes their prices to rise, ultimately resulting in a decrease in bond yields.

By calculating the ratio of copper to gold, one can effectively capture changes in the business cycle and their subsequent impact on bond yields. Plotting the copper-to-gold ratio against 10-year yields provides a valuable tool for forecasting the direction of bond yields during periods of divergence. Given the high correlation between these two series, their Year-over-Year changes should also move in tandem, as depicted in the accompanying plot.

At present, the divergence between the copper-to-gold ratio and bond yields has narrowed after reaching historic highs. Consequently, it is reasonable to anticipate their convergence moving forward. The question lies in whether yields will converge in a manner consistent with historical patterns or if the copper-to-gold ratio will adjust upwards to align with yields.

copper gold ratio us 10Y yields july 2023 airtham

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