Institutions are rules that are supported by various enforcement mechanisms. Cognition refers to the process of how men perceive and process information, whereas rationality refers to how these processes are modelled. Within institutional economics there is a growing scepticism towards extending the conventional economic frame of analysis to institutions. In particular, the notion of perfect rationality is increasingly questioned. At the same time human cognition has become a major field of research in psychology. This book explores what institutional economics can learn from cognitive psychology regarding the proper modelling of rationality in order to explain institutional change.

Institutions are rules that are supported by various enforcement mechanisms. Cognition refers to the process of how men perceive and process information, whereas rationality refers to how these processes are modelled. Within institutional economics there is a growing scepticism towards extending the conventional economic frame of analysis to institutions. In particular, the notion of perfect rationality is increasingly questioned. At the same time human cognition has become a major field of research in psychology. This book explores what institutional economics can learn from cognitive psychology regarding the proper modelling of rationality in order to explain institutional change.

Advances in the social sciences are used to uncover cognitive foundations of social decision making.

Where do new ideas come from? What is social intelligence? Why do social scientists perform mindless statistical rituals? This vital book is about rethinking rationality as adaptive thinking: to understand how minds cope with their environments, both ecological and social.Gerd Gigerenzer proposes and illustrates a bold new research program that investigates the psychology of rationality, introducing the concepts of ecological, bounded, and social rationality. His path-breaking collection takes research on thinking, social intelligence, creativity, and decision-making out of an ethereal world where the laws of logic and probability reign, and places it into our real world of human behavior and interaction. Adaptive Thinking is accessibly written for general readers with an interest in psychology, cognitive science, economics, sociology, philosophy, artificial intelligence, and animal behavior. It also teaches a practical audience, such as physicians, AIDS counselors, and experts in criminal law, how to understand and communicate uncertainties and risks.

In a complex and uncertain world, humans and animals make decisions under the constraints of limited knowledge, resources, and time. Yet models of rational decision making in economics, cognitive science, biology, and other fields largely ignore these real constraints and instead assume agents with perfect information and unlimited time. About forty years ago, Herbert Simon challenged this view with his notion of "bounded rationality." Today, bounded rationality has become a fashionable term used for disparate views of reasoning. This book promotes bounded rationality as the key to understanding how real people make decisions. Using the concept of an "adaptive toolbox," a repertoire of fast and frugal rules for decision making under uncertainty, it attempts to impose more order and coherence on the idea of bounded rationality. The contributors view bounded rationality neither as optimization under constraints nor as the study of people's reasoning fallacies. The strategies in the adaptive toolbox dispense with optimization and, for the most part, with calculations of probabilities and utilities. The book extends the concept of bounded rationality from cognitive tools to emotions; it analyzes social norms, imitation, and other cultural tools as rational strategies; and it shows how smart heuristics can exploit the structure of environments.

It is often argued that democratic institutions should be designed to produce good outcomes, assuming that we know what good outcomes are and which institutions will track them. This book denies both assumptions. The idea of the general interest is ill-defined and our understanding of social causality is fragile. Instead, one should reduce as much as possible the impact of self-interest, passion, prejudice, and bias on the decision makers, and then let the chips fall where they may. In addition to making novel theoretical proposals, this book discusses a welter of case studies and historical episodes.

The social sciences study knowing subjects and their interactions. A "cog nitive turn", based on cognitive science, has the potential to enrich these sciences considerably. Cognitive economics belongs within this movement of the social sciences. It aims to take into account the cognitive processes of individuals in economic theory, both on the level of the agent and on the level of their dynamic interactions and the resulting collective phenomena. This is an ambitious research programme that aims to link two levels of com plexity: the level of cognitive phenomena as studied and tested by cognitive science, and the level of collective phenomena produced by the economic in teractions between agents. Such an objective requires cooperation, not only between economists and cognitive scientists but also with mathematicians, physicists and computer scientists, in order to renew, study and simulate models of dynamical systems involving economic agents and their cognitive mechanisms. The hard core of classical economics is the General Equilibrium Theory, based on the optimising rationality of the agent and on static concepts of equilibrium, following a point of view systemised in the framework of Game Theory. The agent is considered "rational" if everything takes place as if he was maximising a function representing his preferences, his utility function.