Which supply chain innovation had the most profound impact on overcoming geographic barriers in global retail trade during the 20th century?

The modern retail landscape has been shaped by supply chain innovations that overcome geographic barriers. This poll tests your knowledge about a revolutionary approach that transformed how products move across continents and redefined global trade patterns. Consider how geographic challenges have historically limited retail expansion and which innovation most significantly addressed these limitations.

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Standardized shipping containers (developed in the 1950s)
Overnight air freight services (popularized in the 1970s)
Just-in-time inventory management (widespread adoption in the 1980s)
RFID tracking technology (commercial implementation in the 1990s)