Estimating the impact of Commonwealth membership on trade

He produced a background paper estimating the effects of Commonwealth membership on goods and services trade and was also a member of the Commonwealth Secretariat’s Technical Review Committee on this project.
On average, Commonwealth membership is found to increase goods exports by 18.5-33.2% and services exports by 42.8% in Anirudh Shingal’s empirical results that are both cited and referred to in this flagship report. 
The report can be accessed here: http://thecommonwealth.org/commonwealth-unfolding-global-trade-landscape