The present study proposes a quantitative measure of the concept of trade policy space and investigates its impact on countries' economic growth and transitional convergence in terms of economic development. In this study, trade policy space is considered as the room for maneuver available to a government once its current trade policy departs from the structural domestic and international factors that could influence the trade policy. The transitional convergence is defined as the catch up of a country's real per capita income with the world's average real per capita income.The empirical analysis covering 150 countries from 1995 to 2015 shows that although the trade policy space exerts a positive impact on economic growth, this positive effect depends on countries' structural policies. Furthermore, the study results indicate that the trade policy space exerts a positive and significant effect on transitional convergence, and the greater the trade policy space, the higher is the transitional convergence. JEL Classifications: F13, F14, F63, O40 jei 2 1 According to UNCTAD (2014: Chapter V), North-South Agreements contain a larger number of both WTO-plus and WTO-extra provisions than either North-North or South-South Agreements. These provisions cover coopetition policy, investment and capital movement, government procurement, labor mobility and environmental standards. UNECA (2016) has provided concrete examples on how RTAs such as Economic Partnership Agreements could restrict more policy space than WTO rules. jei 3 trade regime. It's a recent report by UNECA (2015: Chapter 5, p157) stressed that the main concern for Africa in terms of policy space relates to RTAs, which might further limit policy options for industrialization. As several African countries are least developed countries (LDCs), which are favorably treated under the WTO rules, the UNECA report has concluded that the loss of policy space for African economies has so far been relatively insignificant.Van der Ven (2017, p75) debated that the complexity of WTO rules and their economic effect may lead a country, in good faith, to adopt policies that are inconsistent with WTO rules. Based on case studies from three non-LDCs African countries (Ghana, Kenya, and Namibia) on industrial policy priorities and key trade and investment laws and regulation, she concluded that Africa's industrialization is not genuinely restricted by the shrinking of the WTO policy space. Thus, from her perspective, a key impediment to the implementation of industrial policy objectives in Africa was the lack of policy alignment and understanding of the WTO policy space. The Overseas Development Institute (ODI 2007) argues that there are benefits that can be derived precisely from the restriction of trade policy space arising from the constraints imposed by international rules, including international trade obligations. The underlying rationale is that international regulations provide an international commitment (lock in), which is more stable than domestic regulation.While sever...