Business There is an urgent need to improve WTO, say G20 ministers Updated : September 15, 2018 01:42 PM IST German Deputy Economy Minister Oliver Wittke said the joint declaration sent a powerful signal about the importance of strengthening WTO. Protesters burned makeshift American flags and chanted against free trade orthodoxy. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.