Power and Influence
This book investigates the metaphysical presuppositions of a common—and very successful—reductive approach to dealing with the complexity of the world. The reductive approach in question is one in which we study the components of a complex system in relative isolation, and use the information so gained to explain or predict the behaviour of the complex whole. So, for example, ecologists explain shifts in species population in terms of interactions between individuals, geneticists explain traits of an organism in terms of interactions between genes, and physicists explain the properties of a gas in terms of collisions between the particles that make up the gas. It is argued that this reductive method makes substantive metaphysical assumptions about the world. In particular, the method assumes the existence of causal powers that manifest ‘causal influence’—a relatively unrecognized ontological category of which forces are a paradigm example. The success of the reductive method, therefore, is an argument for the existence of such causal influence. The book goes on to show that adding causal influence to our ontology gives us the resources to solve some traditional problems in the metaphysics of powers, causation, emergence, laws of nature, and possibly even normative ethics. What results, then, is not just an understanding of the reductive method, but an integrated metaphysical world view that is grounded in a novel ontology of power and influence.