Monopoly Power and the Firm’s Valuation: A Dynamic Analysis of Short versus Long-Term Policies -- Revealed Intertemporal Ineffciency -- Volatility and Job Creation in the Knowledge Economy -- Existence of Sunspot Equilibria and Uniqueness of Spot Market Equilibria: The Case of Intrinsically Complete Markets -- Survival, Uncertainty, and Equilibrium Theory: An Exposition -- On Price-Taking Behavior in Asymmetric Information Economies -- Ambiguity aversion and the absence of indexed debt -- Sunspots, Indeterminacy and Pareto Inefficiency in Economies With Incomplete Markets -- Growth in Economies With Non Convexities: Sunspots and Lottery Equilibria, Theory and Examples -- Shaking the Tree: An Agency-Theoretic Model of Asset Pricing -- Central-Bank Interest-Rate Control in a Cashless, Arrow-Debreu Economy.This collection of essays honors David Cass on the 30th anniversary of his joining the faculty of the Department of Economics at the University of Pennsylvania. Prof. Cass’s work has spawned a number of important lines of research in Economics, including the study of dynamic general equilibrium, the concept of sunspot equilibria, and general equilibrium theory when markets are incomplete. These essays, by his students and co-authors, celebrate his work and his influence on the profession.