The public authority in Hong Kong which operates the rapid rail transit system has estimated that it will be able to cover 60 percent of the capital costs of one line currently under con- struction by selling land adjacent to subway stations and air rights over them to real estate developers. Anticipated fare revenues will more than cover the line's operating and remaining capital costs yielding a substantial profit to the authority. Does the line's profitability prove that the present value of net benefits to the hong Kong economy exceed the present value of the capital costs? Why