We find preferences that discount utility from future consumption yet violate the standard growth condition in representative-agent endowment economies. Such economies have no competitive equilibria, but have quasi equilibria. The supporting price systems include a type of speculative bubble.

We combine and strengthen optimality and robustness theorems for the overlapping-generations model of money. Roughly, we find a Pareto-optimal monetary equilibrium of a generic stationary economy that is near an optimal monetary equilibrium of each nearby non-stationary economy. Since the nearby...

We reappraise the robustness of sunspot effects in overlapping-generations models. Azariadis’s well-known example economies have stationary, deterministic fundamentals (preferences, technologies, and endowments), yet sunspots affect multiple equilibria. And those equilibria are robust to...