investment shall lie with the operator having an obligation for cost orientation of prices. The Communications Regulatory Authority may lay down cost accounting rules for the purpose of calculating the cost of efficient provision of services and/or networks. The Communications Regulatory Authority may require an operator who has an obligation for cost orientation of its prices to provide full justification for cost-oriented pricing; the Authority may set a reasonable mandatory time limit for the submission of such justification. Should the operator fail to provide justification for its cost-oriented pricing within the established time limit, it shall be deemed that its prices are not cost-orientated. The Communications Regulatory Authority shall have the right to require that the data submitted by the operator be audited at the operator's expense. Until an operator who has an obligation for cost orientation of its prices provides full justification for its cost-oriented pricing, the Communications Regulatory Authority may temporary set price caps taking into account the data about relevant costs obtained on the basis of indirect cost assessment methods, including the comparison of prices for relevant services, having regard to the best practice of European Union Member States, the practice of countries with a similar level of development and the practice of the Republic of Lithuania, and the assessment of the ratio between relevant wholesale and retail prices. 4. The Communications Regulatory Authority may require an operator who has an obligation regarding the cost control to provide evidence of relevance of its prices and set a reasonable mandatory time limit for the submission of such evidence. In case the operator fails, within the time limit set by the Communications Regulatory Authority, to provide relevance of prices, the prices shall be considered as irrelevant. The Communications Regulatory Authority shall have the right to require that the data submitted by the operator be audited at the operator's expense. The Communications Regulatory Authority shall have the right to request a change in the prices or establish price caps by comparing the prices of the services concerned, taking into account the best practice of the European Union Member States, practice of similarly developed states, and the practice of the Republic of Lithuania as well as assessing the wholesale and retail price ratio. 5. Should the Communications Regulatory Authority, in order to ensure a price control system, authorise the operator to implement the cost accounting system, the operator must, within the time limit and in accordance with the procedure and conditions set by the Communications Regulatory Authority, prepare a cost accounting system, make its description public, submit it to the Communications Regulatory Authority, and maintain compliance with it. The cost accounting system and the manner of its publication must be 39

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