What concept explains why the total number of successful launches significantly outpaces the number of unique rocket bodies built?

Answer

The reuse of hardware

The impressive mission counts are deeply intertwined with the success of booster reuse; a single Falcon 9 booster can fly dozens of times, creating a multiplier effect on the launch count.

What concept explains why the total number of successful launches significantly outpaces the number of unique rocket bodies built?

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SpaceX Cleared for 100 Launches a Year from California - YouTube

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