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1958 Member States shall take all general or particular measures which are appropriate for ensuring the carrying out of the obligations arising out of this Treaty or resulting from the acts of the institutions of the Community. They shall facilitate the achievement of the Community’s aims.

They shall abstain from any measures likely to jeopardise the attainment of the objectives of this Treaty.

1. Member States, acting in close collaboration with the institutions of the Community, shall co-ordinate their respective economic policies to the extent that is necessary to attain the objectives of this Treaty.

2. The institutions of the Community shall take care not to prejudice the internal and external financial stability of Member States.

Within the field of application of this Treaty and without prejudice to the special provisions mentioned therein, any discrimination on the grounds of nationality shall hereby be prohibited.

The Council may, acting by means of a qualified majority vote on a proposal of the Commission and after the Assembly has been consulted, lay down rules in regard to the prohibition of any such discrimination.

1. The Common Market shall be progressively established in the course of a transitional period of twelve years.

The transitional period shall be divided into three stages of four years each; the length of each stage may be modified in accordance with the provisions set out below.

2. To each stage there shall be allotted a group of actions which shall be undertaken and pursued concurrently.

3. Transition from the first to the second stage shall be conditional upon a confirmatory statement to the effect that the essence of the objectives specifically laid down in this Treaty for the first stage has been in fact achieved and that, subject to the exceptions and procedures provided for in this Treaty, the obligations have been observed.

This statement shall be made at the end of the fourth year by the Council acting by means of a unanimous vote on a report of the Commission. The invocation by a Member State of the non-fulfilment of its own obligations shall not,