SHANGHAI Mayor Yang Xiong met Nigerian President Muhammadu Buhari and his delegation last week. Yang said Shanghai has long-term exchanges and cooperation with African countries. In 2010, it helped many African countries to participate in the World Expo the city was hosting. He spoke highly of Nigerian president’s emphasis on infrastructure development, which is important for the prosperity of a country. The mayor said Shanghai is carrying out many infrastructure projects and is improving business environment for Chinese and foreign investors.