Splash247: Shipping’s crystal ball cracks in the 2020s

Published by Splash247

Shipping has long been treated as an early warning system for the world economy. In an era of wars, rerouting, services and AI, the relationship is becoming far harder to read. Splash investigates whether this old adage rings true still, or even if it ever did.

For decades, shipping has enjoyed a reputation as one of the world economy’s more useful early warning systems.

The logic was compelling for many. Dry bulk demand reflected industrial production and commodity consumption, while container flows provided a window into consumer spending and manufactured trade. If ships become busier, the theory goes, broader economic activity would follow several months later.

“In previous decades, it was certainly true that the shipping markets served as an early indicator of the strength of the global economy,” Adam Kent, managing director of UK consultancy Maritime Strategies International (MSI), tells Splash.

Dry bulk demand, Kent says, has historically provided an important guide to growth in emerging economies, most notably China this century, while containerised cargoes offered a proxy for Western consumer demand.

Charles de Trenck, an American equity and debt investor who previously led Citi’s highly ranked Asia transport research operation, also gives some credence to the old rule.

“In general yes,” he says, while stressing that wars and other major disruptions can badly distort the relationship.

There is academic backing for the theory too. Researchers have found links between the Baltic Dry Index and future industrial activity, while the International Monetary Fund has examined shipping indicators as leading or real-time measures of world trade.

Kent says the relationship has deteriorated over the past few years. Shipping is currently enjoying one of the strongest earnings environments in its history even though global seaborne trade is likely to shrink this year and world GDP growth remains comparatively steady.

Wars, sanctions, congestion, rerouting and policy changes are creating demand for ships that bears an increasingly loose relationship with underlying cargo growth. Tonne-miles have become at least as important as tonnes.

A cargo diverted thousands of miles around a chokepoint can boost vessel demand dramatically without adding anything to global trade volumes. Dry bulk has remained resilient despite three consecutive years of falling Chinese steel production partly because commodities are being sourced from further away. Tanker earnings increasingly reflect energy security, sanctions and altered trading patterns rather than simply growth in oil consumption.

Roar Adland, global head of research at shipbroker SSY, is more sceptical about the entire premise.

“The claim that shipping is a predictor of the world economy was always dubious,” Adland tells Splash, adding that the relationship is likely to weaken further.

Fleet supply is one problem. Freight rates reflect not only cargo demand but the number of available ships, and vessel supply is inherently lagging because tonnage ordered in one market can arrive several years later in completely different economic conditions.

The changing composition of GDP presents another challenge. Services increasingly dominate developed economies, while AI and computing are becoming larger contributors to economic activity without producing comparable volumes of physical cargo.

Containers are hardly immune. Pandemic-era moves from just-in-time towards just-in-case inventories, tariff frontloading and increasingly convoluted supply chains mean box volumes and freight rates can diverge sharply from final consumer demand.

De Trenck argues that containers have also become heavily influenced by outsized US consumption and government deficit spending, reducing their usefulness as a clean global indicator.

Martin Stopford goes further. The veteran shipping economist, former global shipping economist at Chase Manhattan and longtime head of Clarksons Research, literally wrote the book on the subject. His seminal Maritime Economics, first published in 1988 and now approaching a fourth edition, has educated generations of shipping executives and analysts on cycles, supply, demand and forecasting.

For Splash readers, Stopford has actually tested the old adage. For this article, he compared annual growth in world industrial production between 1954 and 2025 with the percentage change in dry cargo freight rates during the preceding year. The correlation coefficient was just 3.3%, one of the lowest he has ever encountered,, describing the idea that freight rates lead the economy as a “cart before the horse” model.

There are simply too many freight markets, he argues, and too many shipping-specific variables such as stockbuilding, congestion and fleet supply.

Richard Diamond, principal at investor Castlewood Capital Partners, is similarly dismissive of finding one magic shipping indicator.

“No, no, and yes,” is his response to whether shipping leads the economy, whether any one sector offers the best signal and whether the relationship has changed in the 2020s.

Shipping demand today, Diamond argues, is being shaped by geopolitics, weather, European energy policy, tariffs and deindustrialisation. Yet he notes an interesting paradox familiar to shipping investors: nobody knows where spot freight rates will be in two weeks, but it can still be possible to make an informed judgement on whether rates will be higher or lower six months ahead.

Perhaps the more useful economic signal today is not freight rates at all, but the physical movement of ships.

Jan Hoffmann, global lead for maritime transport and ports at the World Bank and previously head of UNCTAD’s Trade Logistics Branch, points out that official trade statistics only appear after customs declarations are filed. A ship’s location, origin, destination and speed, by contrast, can be observed almost instantly. That data can create what he describes as “now-casts” of trade long before conventional statistics catch up.

That may be the modern version of shipping’s economic crystal ball. Ships still provide an extraordinarily timely view of what the physical world economy is doing. Freight rates increasingly reveal something broader: not just economic growth, but the effects of geopolitics, supply-chain strategy, fleet supply and disruption.

Shipping has not stopped being a barometer of the world economy. The problem is that the instrument is now measuring far more than one thing.