Taxing private auto travel as well as subsidizing mass transit will most effectively limit auto travel and raise the use of mass transit when the price elasticities of demand for auto travel: (1) and mass transit are low, and the cross-elasticity of demand among them is low. (2) and mass transit are high and the cross-elasticity of demand among them is low. (3) are low, when those for mass transit are high, as well as their cross-elasticities are negative. (4) and mass transit and the cross-elasticity of demand among them are all high. (5) and mass transit are low, as well as their cross elasticities of supply are low.
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