How would an economic system based on libertarian socialist principles actually work in practice? What kind of information would need to be recorded in order to enable democratic participation, efficient decision-making and equitable outcomes? Using the economic model Participatory Economics as a framework, this book proposes a set of accounting principles for an economy comprised of common ownership of productive resources, federations of worker and consumer councils, and democratic planning. Anders Sandström is a trained accountant with a degree from Uppsala University. He is a co-founder of Parecon Sverige, a Participatory Economics advocacy group in Sweden.