Karatzas, Ioannis; Lehoczky, John P.; Shreve, Steven E. - In: Mathematical Finance 1 (1991) 3, pp. 11-29
General equilibrium models in which economic agents have finite marginal utility from consumption at the origin lead to financial assets having continuous prices with singular components. In particular, there is no bona fide "interest rate" in such models, although asset prices can be determined...