TY - BOOK AU - Dumas,Bernard ED - National Bureau of Economic Research. TI - Super Contact and Related Optimality Conditions: A Supplement to AvinashDixits T2 - NBER technical working paper series PY - 1989/// CY - Cambridge, Mass. PB - National Bureau of Economic Research N1 - April 1989; Hardcopy version available to institutional subscribers N2 - Dixit (1988) observed that the mathematical construct of "regulated Brownian motion" developed by Harrison (1985) had proved useful in economic models of decision-making under uncertainty. In a recent note he provided a number of methods for calculating expected discounted payoff functions based on such processes. The purpose of this supplement is twofold: -determine to what extent the first-degree conditions reached by Dixit (his equations (12) and (13) or (12') and (13')) are simply a consequence of the definition of the expected discounted payoff, or to what extent they can be interpreted as first order conditions of some optimization problem, as has been suggested in Dumas(1988); -extend Dixit's treatment to the case where there are fixed costs of regulation as 1n Grossman-Laroque (1987) UR - https://www.nber.org/papers/t0077 UR - http://dx.doi.org/10.3386/t0077 ER -