Most places that lose their people to emigration never build institutions to bring them back. Jiangmen did — and what it built is not a slogan but a paper chain with dates. A clause in Chapter 8 of the 2019 Greater Bay Area development plan supports building an overseas-Chinese cultural-exchange-and-cooperation important platform (华侨华人文化交流合作重要平台, Huáqiáo Huárén…