Sec. 52.29  Cost recovery for transitional measures for number 
          portability.

    Any cost recovery mechanism for the provision of number portability 
pursuant to Sec. 52.7(a), that is adopted by a state commission must 
not:
    (a) Give one telecommunications carrier an appreciable, incremental 
cost

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advantage over another telecommunications carrier, when competing for a 
specific subscriber (i.e., the recovery mechanism may not have a 
disparate effect on the incremental costs of competing carriers seeking 
to serve the same customer); or
    (b) Have a disparate effect on the ability of competing 
telecommunications carriers to earn a normal return on their investment.