“…finding a consumption/investment path over time that maximizes the social value of a set of capital stocks [20,21]. The stock of interest may be related to the built environment [4,22], a pollutant [23][24][25], atmospheric CO 2 , a fish, groundwater, forest, or any natural resource stock [5,8,[26][27][28], or any combination, e.g. [8,[29][30][31][32].…”