A prime contractor provides a turnkey solution, so-called because the buyer only has to turn one key to get the job done.

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A prime contractor is responsible for providing a complete solution to the buyer, handling all aspects of the project from design to implementation. Therefore, it is referred to as a turnkey solution as the buyer only needs to "turn one key" to have the job done.

A Prime Contractor Provides a Turnkey Solution, So-Called Because the Buyer