wikipedia definition
The famous Christaller model refers to medium-size towns in Southern Germany in the 1930s. This is a poor guide to the understanding of urban competitiveness in the ICT age. On needs to rethink the key concepts of spatial economics. Some of them are promising, e.g. networks (Dupuy), graph theory (Auray/Mathis) or innovative milieux (Maillat).
With distance being by far the crucial concept of regional science, one has to prepare for ‘the death of distance’. One also has to prepare for practice, the real test of ideas.