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— Effects of the Tight Financial Context on the Cost of Public Services — In a tight financial environment, the use of tariffs is often put forward as an alternative to taxes or at least as an alternative to increasing taxes. In France, tariff revenue has not been broached in a comprehensive manner; analyses are often carried out on a case by case or sectoral basis. The ongoing debate and examples from abroad attest to the topical nature of this issue. The use of tariffs or pricing nevertheless has serious consequences both in terms of the evolution of public action and of social justice.