
Source: "A general equilibrium approach to monetary theory" (1969), p. 29 as cited in: Andrés, Javier, J. David López-Salido, and Edward Nelson. " Tobin's imperfect asset substitution in optimizing general equilibrium http://research.stlouisfed.org/wp/2004/2004-003.pdf." Journal of Money, Credit and Banking (2004): 665-690.