The price of economy "of the bank of Sweden to the memory of Alfred Nobel" 2005 awarded to Thomas Schelling is, with the Nobel Prize of chemistry awarded in 1977 to Ilya Prigogine, for his work on the dissipative structures, one of the unusual prices which challenge directly the community of the geographic modelers. Because it "contributed to a significant degree to reduce the gap between the social economy and other sciences and of the behaviour", Thomas Schelling is indeed largely quoted in geography, mainly by the searchers involved in the geographic complex systems. If he owes mainly this price to his work in game theory, it is his contribution to a fundamental question -How individual behaviours may produce phenomena which pure theory cannot anticipate? – which is related to our purpose.