“…Informality has previously been studied from a static perspective, with an emphasis on the physical spaces or category of labor, such as the informal economy, informal labor, and informal settlement [ 40 , 41 , 42 , 43 , 44 ]. Recently, more research has overcome the dichotomy between formality and informality and has seen them as an inter-related and complementary unity [ 45 , 46 ]. The concept of “formality–informality” has frequently been taken as a starting point to study complex and dynamic urban issues and to explore the cooperation approaches between formal institutions and local residents’ spontaneous practices to form effective resource allocation or practice promoting socioeconomic development [ 47 , 48 ].…”