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4. No Member shall grant a new subsidy or increase an existing subsidy affecting the export of a primary commodity, during a commodity conference called for the purpose of negotiating an intergovernmental control agreement for the commodity concerned unless the Organization concurs, in which case such new or additional subsidy shall be subject to the provisions of Article 28. 5. If the measures provided for in Chapter VI have not succeeded, or do not promise to succeed, within a reasonable period of time, or if the conclusion of a commodity agreement is not an appropiiate solution, any Member which considers that its interests are seriously prejudiced shall not be subject to the requirements of paragraphs 1 and 3 of Article 26 in respect of that commodity, but shall be subject to the provisions of Article 28. Article 28 Undertaking regarding Stimulation of Exports of Primary Commodities 1. Any Member granting any form of subsidy, which operates directly or indirectly to maintain or increase the export of any primary commodity from its territory, shall not apply the subsidy in such a way as to have the effect of maintaining or acquiring for that Member more than an equitable share of world trade in that commodity. 2. As required under the provisions of Article 25, the Member granting such subsidy shall promptly notify the Organization of the extent and nature of the subsidization, of the estimated effect of the subsidization on the quantity of the affected commodity exported from its territory, and of the circumstances making the subsidization necessary. The Member shall promptly consult with any other Member which considers that serious prejudice to its interests is caused or threatened by the subsidization. 3. If, within a reasonable period of time, no agreement is reached in such consultation, the Organization shall determine what constitutes an equitable share of world trade in the commodity concerned and the Member granting the subsidy shall conform to this determination. 4. In making the determination referred to in paragraph 3, the Organization shall take into account any factors which may have affected, or may be affecting world trade in the commodity concerned, and shall have particular regard to : (a) The Member country's share of world trade in the commodity during a previous representative period ; .(6) Whether the Member country's share of world trade in the commodity is so small that the effect of the subsidy on such trade is likely to be of minor significance ;