This study examines the link between tourism development with the tourism-friendly behavior of local residents and the mediating role of residents\\\\\\\\\\\\\\\' overall quality of life (QOL) in this regard. A sample of 384 residents of Mashhad city in Iran completed a questionnaire. Structural equation modeling (SEM) with Warp PLS was used for model estimation. The findings indicate that tourism development related to residents\\\\\\\\\\\\\\\' QOL and their tourism-friendly behavior positively. QOL partly mediates the relationship between tourism development and tourism-friendly behaviour. Moreover, the social and economic impacts of tourism development have a stronger association with QOL than the environmental and cultural impacts, and the impact of the social and environmental impacts of tourism development on tourism-friendly behavior is stronger than the economic impact. Current studies on local settings lack a comprehensive investigation of the link between tourism development, QOL and tourism-friendly behavior. The research findings could help researchers and authorities to recognize the key factors that predict residents\\\\\\\\\\\\\\\' QOL and tourism-friendly behavior.

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