The effect of financial constraints on the optimal design of public transport services |
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Authors: | Sergio R Jara-Díaz Antonio Gschwender |
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Institution: | (1) Universidad de Chile, Casilla, 228-3 Santiago, Chile |
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Abstract: | Recent experience with the design of bus services in Santiago, Chile, seems to confirm Jansson's (1980) assertion regarding
observed planned bus frequency and size being too low and too large, respectively. We offer an explanation based upon the
relation between cost coverage, pricing and optimal design variables. We recall that average social cost decreases with patronage,
which generates an optimal monetary fare below the average operators' cost, inducing an optimal subsidy. Then we compare optimal
frequency and bus size—those that minimize total social costs—with those that minimize operators' costs only. We show that
an active constraint on operators' expenses is equivalent to diminish the value of users' time in the optimal design problem.
Inserting this property back in the optimal pricing scheme, we conclude that a self-financial constraint, if active, always
provokes an inferior solution, a smaller frequency and, under some circumstances, larger than optimal buses.
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Keywords: | Keyword" target="_blank">Keyword Public transport Subsidy Optimal frequency Optimal bus size Self-financial constraint |
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