In this paper we compare two instruments of access price regulation, cost-based and retail-minus, with the full deregulation hypothesis. We consider an upstream monopolist firm that sells a vital input to an independent firm and to a subsidiary firm in the downstream market. We conclude that the retail-minus regulation avoids foreclosure and leads to better results than cost-based regulation in terms of investment level and consumer surplus. Moreover, retail-minus regulation allows a higher consumer surplus than deregulation of access price as long as the regulator carefully defines the retail-minus instrument. We also compare retail-minus regulation with the Efficient Component Pricing Rule and we conclude that the two mechanisms can lead to different results.
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Paper provided by Universidade do Porto, Faculdade de Economia do Porto in its series CETE Discussion Papers with number
0603.
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