Final answer:
Geographer Walter Christaller developed the 'Christaller's Central Place Theory', which explains the pattern of cities, towns, and villages. It is based on the need for goods and services and the maximum distance people are willing to travel to acquire them.
Step-by-step explanation:
The 'Christaller's Central Place Theory' was developed by geographer Walter Christaller. He noticed the pattern of cities, towns, and villages on the Earth and developed this theory to explain the processes behind this pattern. Central Place Theory explains how a predictable hierarchy of settlements emerges based on the need for goods and services and the maximum distance people are willing to travel to acquire them.