Some metropolitan regions may have a significant food-processing sector, but mainly rely on raw materials from outside the region. While locally produced food is limited in quantity, these regions have good access to a wide variety of imported food, either from other regions in the country or imports from other countries. In developing countries, connectivity to foreign markets happens first in large cities, and these urban agglomerations have the densest networks of connections, largely because markets develop first and in greater complexity in cities.