2. Notwithstanding the prov1s1ons of paragraph 1, State Parties may regulate capital movements subject to their domestic laws and regulations, when necessitated by economic constraints. 3. State Parties that introduce new regulations in the circumstances described in paragraph 2 shall notify the Secretariat for information purposes within a period of three (3) months of introducing such regulations. ARTICLE 16 COMPETITION POLICY State Parties undertake through co-operation to advance a competition policy in the Region. ARTICLE 17 INTRA-REGIONAL AND EXTRA-REGIONAL AGREEMENTS FOR THE AVOIDANCE OF DOUBLE TAXATION 1. With a view to encouraging the movement of capital within the Region, particularly to the least-developed countries, State Parties undertake, in line with their undertakings as set out in Annex 3, to conclude between themselves agreements for the avoidance of double taxation. 2. State Parties agree, in line with their undertakings as set out in the Annex 3, to approach their negotiations for agreements for the avoidance of double taxation with countries outside the region on the basis of mutually agreed principles. ARTICLE 18 TRADE, INVESTMENT AND INDUSTRIAL POLICY In recognizing the importance of the link between trade and investment, State Parties agree to pursue trade openness and intra-regional industrial policies and to reduce barriers to intra-regional trade in pursuance of the principles of the SADC Protocol on Trade and any other relevant SADC instruments. ARTICLE 19 HARMONISATION OF POLICIES AND LAWS State Parties shall pursue harmonisation with the objective of developing the region into a SADC investment zone, which shall, among others, include the harmonisation of investment regimes including policies, laws and practices in accordance with the best practices within the overall strategy towards regional integration. 33