3. The Commission shall base the implementing acts referred to in paragraph 1, points (b) and (c) on the following:
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(a)
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the determination of the overall actual and projected costs of providing regulated retail roaming services by reference to the effective wholesale roaming charges for unbalanced traffic and a reasonable share of the joint and common costs necessary to provide regulated retail roaming services;
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(b)
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the determination of overall actual and projected revenues from the provision of regulated retail roaming services;
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(c)
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the consumption of regulated retail roaming services and the domestic consumption by the roaming provider’s customers;
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(d)
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the level of competition, prices and revenues in the domestic market, and any observable risk that roaming at domestic retail prices would appreciably affect the evolution of such prices.
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