This column’s regular readers will know of its faith in ‘Dr Copper’ and the commodity’s status as an economic indicator. If copper prices are firm, the economy is usually doing well and vice-versa.

Equally, this column takes a keen interest in gold, in the view it is not so much a hedge against inflation but a shield against, or potential harbinger of, a loss of control by, or faith in, policymakers when it comes to the wider economy.

This has prompted a reader’s request to study the copper-to-gold ratio and what it may or not mean for financial markets more widely.

We are happy to oblige and must start by showing how this ratio has developed since the early 1970s when US president Richard Nixon withdrew the dollar from the gold standard, scrapped the fixed exchange rate of $35 an ounce and smashed up the Bretton Woods monetary system.

Copper is priced in tonnes and gold in ounces, but the conversion is an easy one, as there are 35,270 ounces in a tonne. If the line on the chart rises, then copper prices are doing better than gold and if it falls then the precious metal is outperforming the industrial one.

In sum, the copper/gold ratio plunged in the 1970s as inflation soared and central banks found themselves struggling to rein it in, to the detriment of markets’ faith in them and also politicians’ ability to forge economic growth during a decade of stagflation.

The ratio has since oscillated with copper largely in the ascendant as the deregulatory policies of the Reagan and Thatcher administrations, coupled with the fierce monetary policy of the Volcker-led Fed, crushed inflation and prosperity became the order the day, with minor wobbles in 1987, 1991-92 and 2000-03 along the way.

Then came the Great Financial Crisis and ever since then gold has been persistently stronger, to perhaps suggest markets think the policy of using ever cheaper debt to solve a debt crisis would not be a lasting solution. And that is where we are today.

One or the other

The past is no guarantee for the future but looking at the copper/gold ratio since 1970, investors could beforgiven for thinking another inflationary outbreak is on the way, as gold stoutly outperforms.

Equally, taking a shorter-term time horizon, the indicator could be implying a deflationary bust, or at least a recession is on the way.

Commodity traders are not sure which but if they are right equity investors may be in for a surprise, as they seem content to still cling to the view that a goldilocks outcome is the most likely, in the form of a moderation in inflation, a soft landing and carefully controlled pivot to lower interest rates in coming.

Either way, the copper/gold ratio is still 50% above its January 1980 all-time low, so more progress from gold could signal trouble ahead. Someone is going to be wrong and if the equity markets have it right then copper should start to outperform gold pretty smartly.

Fixed-income view

Using the US 10-year Treasury (US government bond) as a proxy, fixed-income markets seem similarly perplexed as to whether the declining copper/gold ratio means inflation and headline interest rates are going to return to their post-1980s downward trend or a 1970-style upward march.

The stagflationary 1970s look like an outlier on the trend, but that is why its unexpected return would probably be the worst outcome for all for equity and bond holdings.

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