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Some of the first railroads did indeed duplicate each other ... after which investors generally learned their lesson. In any case, the fact that it is possible to duplicate infrastructure is not in question. What is in question is whether it is efficient. Of course, perhaps ABL really does believe that duplicating the Hume Highway between Goulburn and Yass would be efficient, or the road between Tamworth and Armidale, would be efficient, or the threat of duplication would significantly constrain the quality/signage/pricing signage choices of its current owner. Most economists, however, would not.
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