(4)In some instances, physical assets, software, personnel, and administrative services might be partly deployed to the production of other services not directly related to the production and dissemination of market data. In that respect, it is necessary to apportion the costs attributable to shared resources based on a clear methodology, specifying how much each resource contributes towards the production and dissemination of market data. Financial costs stemming from shared resources should also be apportioned, on the basis of the allocation of such resources to the production and dissemination of market data. The methodology used for apportioning costs should be reviewed annually to ensure its correctness. Market data providers should provide supporting evidence for the chosen methodology and changes thereof to the relevant competent authority.