Digging the dirt at public expense

"The Erie Canal was a mammoth public works project undertaken largely because the scope of the investment was beyond what a private firm could manage during the early 19th century. As with most public works, there were ample opportunities for public officials to realize private gains from the effort, and many did. On the whole, however, the construction of the Erie Canal (and most other major public works projects of the era) appears to have been well conceived and executed; it not only paid off more than its costs through tolls, but also generated substantial welfare improvements for the residents of the state of New York in the form of producer and consumer surplus and a wide range of positive externalities. Although there was obviously some fraud and mismanagement, the public authorities carried out the work at costs relatively close to those projected at the point of authorization. In an effort to try to place this episode in a broader perspective, we compare the ratio of actual expenditures on construction relative to the estimated costs at the time of authorization for the Erie Canal, to those for a range of other public works over American history up to the present day. It i