International trade has been placed prominently into the 2030 Agenda for Sustainable Development, adopted in September 2015, as an engine for economic growth and development. There are at least 20 targets across different SDGs that are related to international trade. These targets relate to both multilateral and regional frameworks of trade rules and trade as economic activity. These are also closely linked with capacity of trade to be a driver of transformative changes which are of critical importance for developing and least developed countries. The Asia-Pacific Trade Agreement (APTA) is one of the oldest preferential trade agreements (PTA) in the region (signed in 1975 as the Bangkok Agreement) and is open for membership to all the developing countries in the ESCAP region. This book analyses how APTA can promote South-South trade and investment as well as help in meeting SDGs. This book will be useful for the policy makers as well as researchers in understanding how RTAs can be used as a tool for development.