Abstract
THE ARTICLE DETAILS THE RELATIONSHIP BETWEEN TRAVEL MODE-SPLIT AND ORDINARY PRICE ELASTICITIES FOR N TRANSPORT MODES. MODE-SPLIT ELASTICITIES CAN BE DERIVED FROM THE N X N SET OF ORDINARY OWN-PRICE AND CROSS-PRICE ELASTICITIES, BUT THE CONVERSE IS NOT TRUE. ONE ORDINARY ELASTICITY ESTIMATE HOWEVER MAKES IT POSSIBLE TO INFER, DIRECTLY AND INDIRECTLY, THE N SECOND STAGE ELASTICITIES. ADDED TO THE MODE-SPLIT ELASTICITIES, THESE GIVE THE ORDINARY ELASTICITIES. EVEN WHEN A SEPARATE ESTIMATE IS NOT AVAILABLE, THE SYSTEM CONSTRAINTS NARROW THE RANGE OF POSSIBLE VALUES OF THE ORDINARY ELASTICITIES.