Whereas many thinkers define freedom as the absence of interference--we are left alone to do as we please--Pettit demands that in their basic life choices free persons should not even be subject to a power of interference on the part of others. This notion of freedom as non-domination offers a yardstick for gauging social and democratic progress and provides a simple, unifying standard for analyzing our most entangled political quandaries.

Pettit reaffirms the ideal, already present in the Roman Republic, of a free citizenry who enjoy equal status with one another, being individually...