“…Naturally, as Salamon (1985) has pointed out, estimates derived from the CRR approach, and, indeed, the approach described above based on cash inflows, are conditional on the assumed shape of the cash flow profile associated with a unit investment in the cash flow profile (because the true cash flow profile is, in general, unknown). Further, it is sometimes possible to amalgamate equations (2) and (3) into a single equation relating r to g , N , CRR, and other parameters of the assumed cash flow profile (as in, for example, Salamon 1982, 1988and Gordon and Hamer, 1988. In general, however, such equations need to be solved by iterative procedures and, hence, the advantages of being able to compress equations (2) and (3) into a single equation are small from a practical point of view.…”