Final answer:
The observation that large cities have greater drawing power for individuals than do small ones is known as the Urban Hierarchy.
Step-by-step explanation:
The observation that large cities have greater drawing power for individuals than do small ones is known as the Urban Hierarchy. This concept is a key component of Central Place Theory, which explains the processes that produce the pattern of cities, towns, and villages. In regions where no single location has significant site location advantages, situation advantages become important, and a predictable geometric pattern of settlements tends to emerge.