Sea-Land's ships came back from Vietnam empty, so it filled them with Japanese TVs and helped launch trans-Pacific container trade

the problem

Container ships returning from Vietnam sailed home empty

background

what everyone would do

Treat the empty return leg as a sunk cost of the Vietnam contracts and move on -- the ships were already profitable enough on the westbound trip, and building a whole new trans-Pacific trade lane from scratch would normally be a multi-year, capital-heavy undertaking nobody would attempt just to fill a few empty hulls.

what they saw

The return trip wasn't actually empty capacity that needed filling from zero -- it was capacity Sea-Land had already fully paid for, which meant any cargo it carried was close to pure profit rather than a new cost center to justify. McLean's question wasn't 'should we enter the Japan trade,' it was 'who already has the local infrastructure we'd need, so we don't have to build it ourselves before the ships sail again.'

the move

According to a former executive, McLean asked his team a single question: 'Anybody know anybody at Mitsui?' In March 1968 Sea-Land hired Mitsui group companies to build a terminal in Yokohama, serve as local agent, and handle domestic trucking, then began weekly sailings carrying Japanese televisions and stereos back to the US West Coast — cargo that was almost pure profit, since the ships' costs were already covered by the Vietnam contracts.

why it works

Because the Vietnam contracts already covered the round-trip cost of every ship, any eastbound cargo Sea-Land carried home required almost no incremental expense to generate revenue, which meant Sea-Land could underprice any competitor who had to cover a full round-trip cost from that one leg alone. Partnering with Mitsui for the terminal, local agency and trucking converted a multi-year infrastructure build into an immediate operational launch, since Mitsui already had the local execution capacity Sea-Land would otherwise have had to construct from nothing -- pairing an idle, already-paid-for asset with an established local partner solved the empty-leg problem and the market-entry problem in the same move.

the payoff

By late 1968 the new lane was crowded rather than empty: seven competing carriers were chasing fewer than 7,000 tons of eastbound freight a month out of Japan. Sea-Land extended container service to Hong Kong and Taiwan in 1969 and to Singapore, Thailand and the Philippines by 1971 — commercial infrastructure built to soak up idle military capacity, in place just as containerized trade with Asia was about to take off. Economists at the time did not foresee how far falling shipping costs would drive the trade growth that followed.

where it breaks

The advantage depends on the outbound cost genuinely being sunk and unavoidable regardless of what the return leg carries -- if the empty leg's cost is instead attributable to the return trip (a dedicated round-trip contract, a lease priced per direction), there's no true zero-marginal-cost capacity to exploit and the entrant faces normal route economics like anyone else. It also requires a capable local partner willing to handle terminal, agency and trucking on short notice; without an established player like Mitsui to plug into, the new lane still needs the multi-year buildout the empty-leg advantage was supposed to let it skip.

what came after

The Yokohama route is cited in histories of container shipping (including Marc Levinson's *The Box*) as the improvised opening of the trans-Pacific container trade — a route born from an accounting quirk (a paid-for empty leg) rather than a deliberate bet on Japan's export rise, which nonetheless positioned Sea-Land as first mover on what became one of the world's busiest container corridors.

references

1. [1]Forbes Global — The Box That Changed Asia and the WorldForbes, 2006forbes.com
2. [2]In Graphic Detail: The Rise of the Shipping ContainerHakai Magazine, 2021hakaimagazine.com
3. [3]Wikipedia — Malcom McLeanWikipedia, 2026en.wikipedia.org

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