8As the Court has moreover stated in its case-law — judgment of 23 January 1975 in the Galli case, Case 31/74 [1975] ECR 427; judgments of 29 February 1976 in the Tasca case, Case 65/75 [1976] ECR 291 and the SADAM case, Joined Cases 88 to 90/75 [1976] ECR 323; judgment of 29 June 1978 in the Dechmann case, Case 154/77 [1978] ECR 1573; judgment of 12 July 1979 in the Grosoli case, Case 223/78, judgment of 18 October 1979 in the Buys case, Case 5/79, and judgment of 11 November 1979 in the Danis case, Joined Cases 16 to 20/79 — in sectors covered by a common organization of the market, and a fortiori when this organization is based on a common price system, Member States can no longer take action, through national provisions adopted unilaterally, affecting the machinery of price formation as established under the common organization. It held in the same judgments that provisions of a Community agricultural regulation which comprise a price system applicable at the production and wholesale stages leave Member States free — without prejudice to other provisions of the Treaty — to take appropriate measures relating to price formation at the retail and consumption stages, on condition that they do not jeopardize the aims or functioning of the common organization of the market in question, in particular its price system.
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