- "Liberty is best for civilizations which desire rapid expansion.
- Adopting Liberty will provide 1 Culture in every city. Unlocks building the Pyramids (in Brave New World).
- Adopting all policies in the Liberty tree will grant a free Great Person of your choice near the Capital."
- — in-game Social Policy Window
Liberty is best used for wide cities, as the bonuses effect (or accumulate) with every new city founded. Apart from flat extra resources per city and early civilian unit bonuses, Meritocracy enables expansion against the high happiness penalty (of 3 per city) – reducing it by 33%. Upon completion, the free Great Person is best used for the more expensive engineers and scientists, granting the increased beaker or hammer improvements, likely at the site of the relevant National Wonder.
As a policy, liberty can be defined as the basic assumption that a nation's citizens deserve to be free. Free from physical restraint, and free from despotic control. Serfs, slaves, and hereditary servants do not enjoy liberty, nor do citizens who are forced to live within a certain village or gulag or ghetto.