What was the 1956 invention that increased the volume of world trade by lowering the cost of shipping?

Question

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The invention of the shipping container in 1956 revolutionized the transportation of goods by minimizing cargo handling costs and enabling easy transfer between ships, trucks, and trains. It significantly lowered the cost of shipping and thus increased the volume of world trade. The other options, such as the personal computer, bar code, and bubble wrap, have also played significant roles in various industries but did not have the same impact on world trade as the shipping container invention.

What Was the 1956 Invention That Increased the Volume of World