Page plan · 12 pages

Written for: Business readers and logistics students

1. 1

   The steel box that changed world trade

   • A plain steel box cut the cost and time of moving goods across oceans.
   • Containerization linked factories and consumers far apart, enabling global supply chains.
   • This deck traces the origins, the standards, the winners and losers, and the scale today.
2. 2

   The first container voyage in 1956

   • In 1956 Malcolm McLean's converted tanker Ideal X sailed from Newark to Houston carrying 58 containers.
   • McLean was a trucking entrepreneur who wanted to move whole truck bodies by sea.
   • The voyage showed that ships could carry sealed boxes rather than loose cargo.
   • It started a shift that reshaped shipping lines, ports and railways.
3. 3

   Loading ships before containers

   • Break-bulk cargo meant sacks, crates and barrels were loaded piece by piece.
   • Dockworkers handled each item by hand or with slings and nets.
   • Ships often spent days in port, waiting for cargo to be loaded and unloaded.
   • Theft, damage and delays were common and made shipping unpredictable.
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   Why handling costs collapsed

   • One crane lift moves a whole box instead of many separate items.
   • Ships spend far less time in port, so each vessel earns more voyages per year.
   • Less manual labor and less damage and theft lower the cost per unit shipped.
   • Cheaper handling made distant markets affordable for ordinary goods.
5. 5

   Agreeing on standard sizes

   • Shared sizes let boxes move between ships, trains and trucks without repacking.
   • The 20-foot and 40-foot lengths became the common standards.
   • The International Organization for Standardization (ISO) helped formalize these dimensions.
   • The TEU, or 20-foot equivalent unit, became the common way to count capacity.
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   Corners, locks and lifting

   • Reinforced corner castings sit at each corner of the box.
   • Twist locks fasten containers to each other and to ships, trucks and railcars.
   • Cranes and spreaders grip the corner fittings to lift the box safely.
   • Strong corners let boxes be stacked high on ships and in terminals.
7. 7

   Wartime supply runs spread the box

   • Military supply runs, notably during the Vietnam War, used containers to move cargo to distant theaters.
   • Faster, more reliable unloading showed the system worked at large scale.
   • Ships returning from the war zone gave shippers a reason to look for more trade routes.
   • Experience from military use helped spread the box to commercial lines.
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   Ports that boomed and ports that faded

   • Ports with deep water and room for cranes and storage expanded into container hubs.
   • Older city piers lacked space and were bypassed or closed.
   • Traffic moved to new terminals away from crowded downtown waterfronts.
   • Dock labor needs fell sharply, changing port jobs and communities.
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   Measuring the trade effect

   • Economists compare trade growth after containerization with other factors like tariffs.
   • Studies link containerization to strong growth in trade between countries that adopted it.
   • Lower shipping costs are only part of the story, alongside trade agreements and policy.
   • Measuring the effect means separating the box from other changes of the period.
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    From city piers to terminals moving 913 million TEU a year

    • World container port traffic rose from 547.1 million TEU in 2010 to 913.3 million in 2024.
    • Growth was steady, reaching 675.1 million in 2014 and 784.3 million in 2018.
    • Traffic was nearly flat between 2018 and 2020, at 784.3 and 791.1 million TEU.
    • From 2020 it climbed to 850.4 million in 2022 and then 913.3 million in 2024.

    Line chart: World container port traffic (million TEU). Source: Container port traffic (TEU: 20 foot equivalent units), IS.SHP.GOOD.TU, World · checked 2026-10-10

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    Ships grow ever larger

    • Shipping lines build bigger vessels to cut the cost per container.
    • Larger ships need deeper channels, bigger cranes and more yard space.
    • Only some ports can handle the largest ships, so hubs gain importance.
    • Bigger ships can strain schedules when a port or canal is disrupted.
12. 12

    What the box teaches about standards

    • The box worked because everyone agreed on common dimensions and fittings.
    • Standards let competing firms share equipment and infrastructure.
    • Early agreement on sizes lowered risk for investors in ships and terminals.
    • Shared rules can unlock large network effects well beyond shipping.