Rhodium Group Publishes 'Chain Reaction' Tariff-Supply Chain Analysis

Rhodium Group has published an analysis titled "Chain Reaction: US Tariffs and Global Supply Chains," framing US trade duties as a continuous input to global freight planning rather than a one-off policy event.

The title is the argument. Rhodium — a New York-headquartered research firm with a track record on US-China economic decoupling, cross-border investment and emissions tracking — treats tariffs the way freight planners already do: as a moving variable in the routing and inventory equation, not a duty-line item that ends at the customs broker.

What's inside the frame?

Standard tariff coverage reads like a customs schedule. Section 301 by country, Section 232 by product, an IEEPA-era baseline rate, sectoral uplifts on steel, EVs, semiconductors. Rhodium's typical lens tracks what each line does next: altered transpacific TEU volumes, rerouted flows through Vietnam, Mexico and Cambodia, reshuffled inventory-to-sales ratios across retail and automotive importers, and the secondary pricing that hits charter rates and box availability at the origin.

What does it change for shippers and forwarders?

The practical question a BCO running a 10,000-FEU annual transpacific program asks is deceptively simple: absorb the duty, reroute through a third country, or pre-build inventory ahead of a known policy date. Each fork has a working-capital cost. The reroute carries a premium per box on Vietnam or India lanes. The nearshoring move ties up cash in a Mexican maquila ramp. The buffer build locks 60 to 90 extra days of stock against a duty wall.

Read against an internal procurement model, an outside view from a firm like Rhodium pressures-tests the assumptions finance teams tend to smooth out — the dwell-hour delta at Long Beach versus Manzanillo, the contract-redate penalty with a 2M alliance carrier, the FX exposure of a peso-denominated supplier move.

Why supply chain teams read this literature first

A tariff changes on a date. The customs broker sees it that morning. The ocean carrier repricing the following Friday feels it within weeks. The consumer price index won't register it for a quarter. Operators running transpacific lanes or inland intermodal networks work on the dated version. Their finance counterparts work on the smoothed quarterly view. That audience split is exactly what Rhodium's title speaks to.

It also lands inside an active policy window. US duties have moved repeatedly through 2024 and 2025 — baseline rates, country-specific deltas, sectoral lifts — and forwarders report margin compression on transpacific headhaul lanes where carriers absorbed part of the volume swing on the way down. An analysis that models the cascade, not the duty line, fits the operating reality.

The takeaway

Call tariffs what they are for freight: a chain reaction. The underlying argument — that shippers should plan against policy cadence rather than react to press-release headlines — lines up with two years of forwarder guidance on buffer sizing, nearshoring pilots and contract renegotiation windows.

Anyone sitting on a 2025 sourcing decision should pull the report before the next tariff calendar update hits. The headline moves the conversation. The propagation is what hits the freight invoice.