The classical twin design (CTD) is the most common method used to infer genetic and environmental causes of phenotypic variation. As has long been acknowledged, different combinations of the common environment/assortative mating, and additive, dominant, and epistatic genetic effects can lead to the same observed covariation between twin pairs, meaning that there is an inherent indeterminacy in ...

We analyze here a classical energy balance model (EBM) with nonlinear feedbacks and revisit in this context a recent claim that — in a model-independent sense — the climate system may exhibit an asymmetric, large-amplitude response to normally distributed forcing; such a response would imply irreducible uncertainty in climate change predictions. We show that equilibrium climate sensitivity in a...

General equilibrium models generically are determinate and have a finite number of equilibria. But, with linear activities and some inelastically supplied factors of production, the economies that arise endogenously as perfect-foresight equilibria proceed through time can robustly be indeterminate. During the initial period of an intertemporal model, the perfect-foresight equilibria typically a...

We show that both real indeterminacy and asset price bubble may appear in an infinite-horizon exchange economy with infinitely lived agents imperfect financial market. explain how the structure heterogeneity (in terms of preferences endowments) affect existence dynamics bubbles as well equilibrium indeterminacy. Moreover, this paper bridges literature on models overlapping generations models.