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(b) If a Member has failed to become a contracting party to the ■General Agreement within two years from the entry into force of this Charter with respect to such Member, the provisions of Article 16 shall cease to require, at the end of that period, the application to the trade of such Member country of the concessions granted, in the appropriate Schedule annexed to the General Agreement, by another Member which has requested the first Member to negotiate with a view to becoming a contracting party to the General Agreement but has not successfully concluded negotiations ; Provided that the Organization may, by a majority of the votes cast, require the continued application of such concessions to the trade of any Member country which has been unreasonably prevented from becoming a contracting party to the General Agreement pursuant to negotiations in accordance with the provisions of this Article. (.c) If a Member which is a contracting party to the General Agreement proposes to withhold tariff concessions from the trade of a Member country which is not a contracting party, it shall give notice in writing to the Organization and to the affected Member. The latter Member may request the Organization to require the continuance of such concessions, and if such a request has been made the tariff concessions shall not be withheld pending a decision by the Organization under the provisions of subparagraph (b) of this paragraph. (d) In any determination whether a Member has been unreasonably prevented from becoming a contracting party to the General Agreement, and in any determination under the provisions of Chapter VIII whether a Member has failed without sufficient justification to fulfil its obligations under paragraph 1 of this Article, the Organization shall have regard to all relevant circumstances, including the developmental, reconstruction and other needs, and the general fiscal structures, of the Member countries concerned and to the provisions of the Charter as a whole. (e) If such concessions are in fact withheld, so as to result in the application to the trade of a Member country of duties higher than would otherwise have been applicable, such Member shall then be free, within sixty days after such action becomes effective, to give written notice of withdrawal from the Organization. The withdrawal shall become effective upon the expiration of sixty days from the day on which such notice is received by the Director-General. Article 18 National Treatment on Internal Taxation and Regulation 1. The Members recognize that internal taxes and other internal charges, and laws, regulations and requirements affecting the internal sale, offering for sale, purchase, transportation, distribution or use of products, and internal quantitative regulations requiring the mixture,