Why Regional Trade Agreement may accelerate trade amongst its member, yet it violates WTO principles of non discrimination?

Paper details:

Assessing the relationship between the WTO and the regional trade agreements (RTAs), as well as the nature and characteristics of the regional trade agreements, do the regional free trade agreements support or undermine progress in the WTO towards removing barriers to trade and investment? You can choose either answers (support or undermine). However, you have to explain your reasons and make your arguments. Note: Focus the argument on the proliferation of RTA/FTA violating WTO principles of Non-Discrimination Paper Structure: Introduction Analytical Framework – Explain WTO principles of Non-Discrimination ( Pros & Cons from various Author) Situational Analysis – Explain how Ecowas has elevated trade in the region? Conclusion References