Having one contractor to meet all your needs has a certain appeal. Generally the implied appeal is “to avoid waste.”
But is it possible that a second contractor, competing with the first, creates an incentive for both to avoid waste?
The problem with sole-sourcing almost anything is that it kills competition. Without competition, cost concerns…aren’t such a big deal.
So in summary, let’s be blunt: competition is good.
John Lehman makes a compelling case for competition and says the Pentagon has the F-35 engine fight all wrong and that Congress has it right.
Using historical facts (wow, what a concept! Proposing to use fact-based decision-making!), Lehman demonstrates the inherent goodness of competition as relates to the big three of acquisition programs, performance, cost, and schedule.

