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The present research develops a model to treat the organization, growth, and contraction of network elements. The components of the model include travel demand, revenue, cost, and investment. Revenue earned by links in excess of maintenance costs is invested on the link until all revenue is consumed. After upgrading (or downgrading) each link in the network, the time period is incremented and the whole process is repeated until an equilibrium is reached or it is clear that it cannot bedoi:10.2139/ssrn.1736160 fatcat:cxvnkvvtyfgxlnt4i47dcokp3i