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Why Mega-Projects Always End Up Costing More Than Expected

And how the part-political, part-psychological problem can be avoided.
relates to Why Mega-Projects Always End Up Costing More Than Expected
Reuters

Last week the San Francisco Chronicle reported that the Transbay Transit Center, a massive transportation hub calling itself the "Grand Central Station of the West," will cost at least $300 million more than project officials estimated. One city official characterized the situation as unfortunate but said it wouldn't have a "meaningful impact" on the project. The comment may have been meant as optimism, but it also reflects the fact that enormous cost overruns have become such a normal part of urban mega-projects that they barely even register as a problem.

So how did it get to the point where the only thing we can confidently expect from a big infrastructure project is that it will cost way more than expected?