Tariff
A tariff is a tax on imports or exports between sovereign states. It is a form of regulation of foreign trade. It is a policy that taxes foreign products to encourage or protect domestic industry. It helps limit trade deficits. The tariff is historically used to protect infant industries and to allow import substitution industrialization.
Individual communication services and tariffs
Individual communication services and tariffs is the regulatory protected ability for an identified user to obtain from a communication service provider, by a bilateral specific contract, a combination of the service and related content, at a specific price (called a tariff chosen by the user) corresponding to a user request specified with a service demand profile and some duration.