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" ... Just to explain how this works. We know there're costs to building something. We also know there are benefits to having built something. So, we add all of both up and then adjust for interest rates and inflation over time. This gives us one great big number when we net the two off: the net present value of the project. What we're looking for here is a positive number. That means that building the project creates wealth: in terms of today's money the project is worth more than the cost of doing it. And we really do try to throw the kitchen sink at these things. The interruption to the sex lives of snail darters of building a bridge over the Delta would be included (assuming, which it isn't, that the train line went that way), the loss of wetlands, pollution during building and so on. ... "