“…In terms of return migration, the “salmon” hypothesis posits that compared with healthy migrants, unhealthy migrants are more likely to be eliminated from the migratory cycle to return home (Lu & Qin, ; Thomson et al, ; Wallace & Kulu, ). As many rural Chinese migrate to urban areas to work as manual labourers (Liang, ), migrants who encounter health problems not only experience decreased productivity and earnings, they are also challenged by costly health care due to a lack of access to urban welfare (Lu & Qin, ; Xie, Wang, Chen, & Ritakallio, ). This, alongside a lack of family support, may motivate less healthy migrants to return to rural areas.…”