Copper versus gold: what an old macro signal is telling us now

Copper is no longer just Dr Copper

Copper has earned its reputation as "Dr Copper" because of its ability to diagnose changes in economic activity. Its widespread use across construction, manufacturing, transportation and electrical equipment means demand has historically moved closely with the industrial cycle. That relationship remains relevant, but the copper market is changing.

Electrification, renewable energy, electricity grids, electric vehicles and increasingly the enormous power requirements associated with data centres and AI infrastructure are creating sources of demand that are less directly tied to the conventional business cycle. The IEA expects copper to record the largest volume growth among the major critical minerals through 2040, driven particularly by electricity networks and next-generation technologies.

At the same time, the supply response remains constrained. Declining ore grades, long mine-development timelines, permitting challenges, capital discipline and disruptions at major producers have all limited the industry's ability to respond quickly to higher prices.

Add trade fragmentation and competition between the US and China for physical metal, and copper increasingly contains a scarcity premium alongside its traditional growth premium.

This is important when interpreting the copper-to-gold ratio. A rising ratio does not necessarily mean global growth is accelerating. It may instead reflect tightening physical supply or a structural repricing of copper's importance to the energy and technology transition.

Gold has undergone an equally important transformation

The other side of the ratio has arguably changed even more. Gold remains sensitive to real interest rates, the dollar and investor risk appetite, but its recent performance increasingly reflects concerns that are difficult to capture through conventional economic indicators.

Geopolitical fragmentation, rising government debt, fiscal sustainability concerns, tariff threats and questions about the future composition of global reserve holdings have increased demand for assets perceived to sit outside the traditional financial system. Gold in particular benefits as a universally recognised and politically neutral asset, not linked to any country’s creditworthiness, making it attractive amid fiat debasement concerns. It is also becoming a core and rising component of central bank reserves and is increasingly viewed as a long-term strategic asset within asset allocation frameworks, given its tendency to be uncorrelated or even negatively correlated with key financial assets.

Central banks have been central to this shift. According to the World Gold Council, central banks have accumulated an average of around 1,000 tonnes of gold annually during the past four years, roughly double the average of the preceding decade. Its 2026 survey also found that 89% of reserve managers expect global central bank gold holdings to increase over the coming 12 months, while a record 45% expect their own institutions to increase holdings.

The trend has recently accelerated. Central bank purchases reached almost 289 tonnes during the second quarter, while geopolitical tensions, a softer dollar and shifting interest-rate expectations have helped drive renewed investor interest. Gold is therefore increasingly trading not simply as a hedge against recession, but as a hedge against monetary, fiscal and geopolitical uncertainty. That distinction matters for the copper-to-gold ratio.

Low ratio does not necessarily mean recession

The current low ratio should therefore not automatically be interpreted as signalling an approaching global recession. Instead, it may be telling us that the monetary and geopolitical premium embedded in gold remains exceptionally large relative to the scarcity and growth premium embedded in copper.

There is a considerable difference between copper collapsing while gold rallies and both metals rallying while gold rises faster. The first is the classic recessionary signal. The second may instead describe a world in which investors remain willing to finance infrastructure, electrification and technology investment while simultaneously becoming increasingly uncomfortable with sovereign debt, geopolitical instability and the purchasing power of fiat currencies.

This makes the ratio less useful as a mechanical forecasting tool but arguably more interesting as an indicator of the prevailing macro regime.

The crucial difference between copper and gold

There is another reason why gold may ultimately retain the upper hand in relative performance. However compelling the structural bull case for copper becomes, copper is still an industrial metal first and foremost.

Consumers need copper because they need what copper can do. That means price matters. At sufficiently elevated prices, companies will respond. Manufacturers can reduce copper intensity, redesign products, substitute aluminium where technically feasible, increase recycling, delay projects or simply decide that certain investments are no longer economic.

In other words, higher copper prices eventually contain the seeds of their own demand destruction. The threshold may be considerably higher than in previous cycles given the urgency of grid investment, electrification and AI-related infrastructure spending. Supply scarcity could therefore still drive copper substantially higher. But industrial demand ultimately has an economic price ceiling, even if nobody knows precisely where it sits.

Gold operates differently. High gold prices certainly destroy jewellery demand, something already visible in World Gold Council data, but jewellery is no longer the only important marginal driver of the market. In Q1, for example, jewellery volumes fell sharply while bar and coin investment surged and central banks continued to accumulate metal. The WGC notes that investment demand now significantly exceeds fabrication demand.

For an investor or central bank seeking gold as portfolio insurance, reserve diversification or protection against currency debasement, a rising price can even reinforce the investment case rather than destroy it. That creates an important asymmetry between the two metals.

Physical scarcity versus monetary scarcity

Copper may therefore continue to rally because the world needs more copper than the mining industry can comfortably supply. Gold may continue to rally because investors and central banks increasingly want an asset whose supply cannot be expanded by governments or central banks.

Both are hard assets, but they protect against different forms of scarcity. Copper represents physical scarcity: the difficulty of supplying enough raw materials to meet the demands of electrification, grids, defence, AI infrastructure and economic development.

Gold increasingly represents monetary scarcity: an asset with limited supply that carries no counterparty risk at a time of rising debt, geopolitical fragmentation and growing demand for reserve diversification.

This distinction could become increasingly important. If the investment environment continues to favour alternative assets and hard assets, copper should remain an obvious beneficiary. However, its industrial nature means increasingly high prices will eventually encounter resistance from consumers.

Gold does not face the same constraint. Its marginal demand increasingly comes from investors and central banks, and for these buyers the objective is not to consume gold but to hold it. That leaves open the possibility that even in a structurally bullish environment for copper, gold may continue to outperform.

Still useful, but no longer an economic oracle

None of this makes the copper-to-gold ratio redundant. Rather, the way we interpret it needs to evolve.

At 3.24, the ratio remains historically depressed but has recovered noticeably from this year's lows. That may indicate copper is beginning to claw back some relative ground as physical scarcity becomes more acute.

But I would be reluctant to interpret the rebound simply as evidence of improving global growth. The ratio should increasingly be viewed alongside copper inventories and spreads, Chinese demand indicators, manufacturing PMIs, real yields, the dollar, government bond markets and central bank gold purchases.

In that context, the copper-to-gold ratio is perhaps evolving from a simple "growth versus fear" indicator into something broader. It is becoming a contest between physical scarcity and monetary scarcity -  between the metal required to build the future and the metal increasingly being accumulated as insurance against the financial system being used to finance it.

And while copper's structural outlook remains compelling, the absence of the same industrial demand-destruction constraint may ultimately give gold an important advantage if the global search for hard assets continues.