Population-change determinants in an early transitional society: the western Sierra Leone example

The author examines the role of geographical and historical processes in village population changes in western Sierra Leone as an example, with particular emphasis on the impact of migration. Both official census and unpublished data are used. Changes in population settlement over the period 1911 to 1963 are reviewed     

THE SPATIO-TEMPORAL SYNCHRONIZATION OF PERIODIC MARKET-PLACES: A RE-EXAMINATION

Analyses of the locational and temporal spacing of periodic market-places have provided only partial confirmation of the hypothesis 'proximity in space implies separation in time.' The patterns, which are observed in almost all empirical studies, are explained here in terms of a simple avoidance rule constrained by the geometry of periodic market-place systems. The results of a series of simulations suggest that the constraints of geometry are such that only simple avoidance rules can be applied, and any more sophisticated rationale is therefore questionable.
Les études portant sur le degré de séparation spatiale et temporelle des places de marché périodique ne confirment que partiellement l' hypothése que proximité spatiale implique séparation dans le temps. Les effets observés dans presque toutes les études empiriques sont éxpliqués ici en terme d' une simple loi d' évitement, sous les contraintes de la géometrie du système des marchés périodiques. Les resultats d'une série d' analyses de simulations suggerent l' existence de contraintes géometriques telles que seules de simples lois d' evitement semblent opérationnelles. Ainsi, toute autre explication plus compliqué est remise en question.