J. McKenzie Alexander – författare

Evolutionary game theory originated in population biology from the realisation that frequency-dependent fitness introduced a strategic element into evolution. Since its development, evolutionary game theory has been adopted by many social scientists, and philosophers, to analyse interdependent decision problems played by boundedly rational individuals. Its study has led to theoretical innovations of great interest for the biological and social sciences. For example, theorists have developed a number of dynamical models which can be used to study how populations of interacting individuals change their behaviours over time. In this introduction, this Element covers the two main approaches to evolutionary game theory: the static analysis of evolutionary stability concepts, and the study of dynamical models, their convergence behaviour and rest points. This Element also explores the many fascinating, and complex, connections between the two approaches.

It is certainly the case that morality governs the interactions that take place between individuals. But what if morality exists because of these interactions? This book, first published in 2007, argues for the claim that much of the behaviour we view as 'moral' exists because acting in that way benefits each of us to the greatest extent possible, given the socially structured nature of society. Drawing upon aspects of evolutionary game theory, the theory of bounded rationality, and computational models of social networks, it shows both how moral behaviour can emerge in socially structured environments, and how it can persist even when it is not typically viewed as 'rational' from a traditional economic perspective. This book also provides a theory of how moral principles and the moral sentiments play an indispensable role in effective choice, acting as 'fast and frugal heuristics' in social decision contexts.

It is certainly the case that morality governs the interactions that take place between individuals. But what if morality exists because of these interactions? This book, first published in 2007, argues for the claim that much of the behaviour we view as 'moral' exists because acting in that way benefits each of us to the greatest extent possible, given the socially structured nature of society. Drawing upon aspects of evolutionary game theory, the theory of bounded rationality, and computational models of social networks, it shows both how moral behaviour can emerge in socially structured environments, and how it can persist even when it is not typically viewed as 'rational' from a traditional economic perspective. This book also provides a theory of how moral principles and the moral sentiments play an indispensable role in effective choice, acting as 'fast and frugal heuristics' in social decision contexts.

Nearly 80 years ago, Karl Popper gave a spirited philosophical defence of the Open Society in his two-volume work, The Open Society and Its Enemies. In this book, J. McKenzie Alexander argues that a new defence is urgently needed because, in the decades since the end of the Cold War, many of the values of the Open Society have come under threat once again. Populist agendas on both the left and right threaten to undermine fundamental principles that underpin liberal democracies, so that what were previously seen as virtues of the Open Society are now, by many people, seen as vices, dangers, or threats.The Open Society as an Enemy interrogates four interconnected aspects of the Open Society: cosmopolitanism, transparency, the free exchange of ideas, and communitarianism. Each of these is analysed in depth, drawing out the implications for contemporary social questions such as the free movement of people, the erosion of privacy, no-platforming and the increased political and social polarisation that is fuelled by social media.In re-examining the consequences for all of us of these attacks on free societies, Alexander calls for resistance to the forces of reaction. But he also calls for the concept of the Open Society to be rehabilitated and advanced. In doing this, he argues, there is an opportunity to re-think the kind of society we want to create, and to ensure it is achievable and sustainable. This forensic defence of the core principles of the Open Society is an essential read for anyone wishing to understand some of the powerful social currents that have engulfed public debates in recent years, and what to do about them.

This open access book offers new insights into issues raised in philosophy of mathematics and in philosophy of science by Imre Lakatos. Lakatos was one of the most significant philosophers of the 20th Century, and his ideas remain important and relevant today. November 2022 saw the centenary of Lakatos’s birth, and the event was marked by an international conference held at the LSE – where Lakatos made his career after he had emigrated from Hungary to England. This volume consists of a selection of papers presented at the conference along with two additional contributions to debates about Lakatos’s continuing influence and importance.