International audienceTropical forests continue to be plagued by the dual sustainability challenges of deforestation and rural poverty. We seekto understand why many of the farmers living in the Brazilian Amazon, home to the world’s largest tropical agricultural-forest frontier,persist in agricultural activities associated with low incomes and high environmental damage. To answer this question, we assess thefactors that shape the development and distribution of agricultural activities and farmer well-being in these frontiers. Our study utilizesa uniquely comprehensive social-ecological dataset from two regions in the eastern Brazilian Amazon and employs a novel conceptualframework that highlights the interdependencies between household attr...