In France, the government in order to set out its economic policy and to praise its results bases itself on a theorical concept. It consists of making financial transfers under diverse forms in favor of enterprises in order to reestablish the main economic balances and notably to come back to full employment. They are them which must offer to the economic agents the goods and the services. Through their support, the supply-side policy allows to reaching these objectives. But to measure its effect and to assess its efficiency, it is important to place that action in comparison with the other ...