(6)To ensure that market data is provided on a RCB, it is necessary to specify how the margin included in the fees for market data should be determined. In particular, the margin should be the operating profit achieved by the market data provider after subtracting from its revenues all the expenses related to the production and dissemination of market data. Such expenses should include operational costs such as infrastructure, assets used for the purpose of connectivity, personnel dedicated to the production and dissemination of market data and financial expenses. To increase transparency, the margin should be expressed as a percentage of costs.