Ports require the performance of several tasks related to market conditions, the tariffs applied, and the rules governing sub-concessions to service providers. Public authorities (national, port level) might have a major or minor role in setting various tariffs applying at the port (e.g. infrastructure, service charges). Depending on the governance model, private service providers may require approval or can set the tariffs independently. Governance tasks also include market monitoring, ensuring the quality of the offered services, applying competition rules, conducting competition-related investigations, handling complaints, and arbitration. All these functions, and thus the choices regarding their governance, are interdependent with the other types of port governance tasks.