AP Human Geography Question of the Day

A premium ride-hailing subscription launched first in global hubs like New York, London, Singapore, and Dubai, where adoption surged among business travelers. Six months later, sign-ups appeared in regional capitals such as Manchester, Lyon, and Bandung, followed by smaller towns linked to those cities. Marketing partnerships emphasized airport lounges, luxury hotels, and corporate travel accounts rather than neighborhood promotions. The spatial pattern shows uptake moving from the largest, most connected urban centers to successively smaller cities, with little evidence of a wave-like spread to adjacent areas.

Which concept best explains the pattern/process shown?