Abstract
In a recent article appearing in this Journal, Hamilton, Whittlesey, Robison, and Ellis (HWRE) address five issues that can arise from estimation of secondary benefits in regional project analysis. In examining these issues, HWRE argue that at most only a small part of secondary benefits resulting from any regional project can be treated as regional net benefits. The argument is well articulated and represents latest of a long line of articles dealing with problem of using estimates of regional economic impact (usually estimated with a regional input-output model) as a measure of project benefits or costs (Cooke; Stabler et al.; Hamilton and Gardner; Young and Gray). The principal concern in HWRE is to ensure that changes in regional value added (or income) due to a project are not mistaken for project benefits in benefit-cost calculations. We are reminded that the as-
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