“…Naturally, under the conditions of Corollary 2.5 we always have the identity KðxÞ ¼ F Z;b ðxÞ on the continuation set where waiting is optimal. A third important implication of Theorem 2.3 characterizing the marginal value of the harvesting opportunity (and, therefore, Tobin's marginal q; for excellent surveys of the classical q-theory of investment, see Abel, 1990;Caballero, 1999) is now stated in our next corollary.…”