Book excerpt: In Essays on Derek Parfit's On What Matters, seven leadingmoral philosophers offer critical evaluations of the central ideaspresented in a greatly anticipated new work by world-renowned moralphilosopher Derek Parfit. Presents critical assessments of what promises to be one of thekey moral philosophy texts of our time Features essays by a team of leading philosophers includingPrinceton's Michael Smith, one of the world's leadingmeta-ethicists Addresses Parfit's central thesis - that the main ethicaltheories can agree on what matters - as well as his defense ofmoral realism