Anthropological Invariants in Travel BehaviorC.MarchettiauthorPersonal travel appears to be much more under the control of basic instinct than of economic drive. This may be the reason for the systematic mismatch between the results of cost benefit analysis and the actual behavior of travelers. In this paper a list of the basic instincts that drive and contain travelers' behavior has been put together, showing how they mesh with technological progress and economic constraints.1994RR-95-004. Reprinted from Technological Forecasting and Social Change, 47(1) [September 1994].Monograph