
The compact city is the idea that higher density, mixed uses and contained urban growth produce more sustainable and liveable cities than dispersed, car-dependent sprawl. The term was popularised by George Dantzig and Thomas Saaty in 1973 and taken up strongly in European policy from the early 1990s, notably in the European Commission's 1990 Green Paper on the Urban Environment. Advocates argue that compactness shortens trips, supports public transport, protects countryside and lowers energy use. Critics question its effects on housing cost, crowding and the environment.
It became the dominant sustainability rationale for densification, infill and growth boundaries in planning policy worldwide. The compact-city argument underlies anti-sprawl regulation and the case for higher-density, transit-served development.