上游充通大学 空间与时间关象 SHANGHAI JIAO TONG UNIVERSITY Space /Fime Relationships 五要素对时空收敛的影响较大： Speed Economies of scale Expansion of transport infrastructures Efficiency of transport terminals Substitution of transportation by telecommunications(信息流取代部分运输)空间与时间关系 Space / Time Relationships 五要素对时空收敛的影响较大： Speed Economies of scale Expansion of transport infrastructures Efficiency of transport terminals Substitution of transportation by telecommunications（信息流取代部分运输）