In the current system, the federal government sends money to states without any real effort to evaluate whether it will pay for worthy projects. States rarely do serious analyses of their own. They build new roads before fixing old ones. They don’t consider whether those new roads will lead to faster traffic or simply more traffic. They spend millions of dollars on legislators’ pet projects and hulking new sports stadiums. In the world of infrastructure, cost-benefit analysis is still a science of the future.
-David Leonhardt, Economics Scene Columnist for the New York Times
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