522. Isotims, Isodapanes & the "Critical" Isodapane

1. Isotims are lines representing points of equal transport costs from one source of a raw material or to one market.

   
   

2. An Isodapane represents points of equal additional transport costs around the (Weberian) minimum-total-transport-cost point; The determination of isodapane surfaces is based on the summing of transport costs to multiple material locations and/or markets via intersecting isotim surfaces.

   
   

3. The Critical isodapane is that isodapane (out of the family of isodapanes which signifies the outer limit for alternative locations (alternative to the location with minimum aggregate transport costs) in a Weberian locational triangle or other polygon. Its specification is dependent on the savings (labor cost, scale- or agglomeration economies) associated with such an alternative; beyond the critical isodapane, savings are not sufficient to compensate for the additional transport costs.

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2002 [econgeog@u.washington.edu]