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We study the existence and uniqueness of the positive solution for the fractional differential system involving the Riemann-Stieltjes integral boundary conditions , , , , , and , where , , and  and  are the standard Riemann-Liouville derivatives,  and  are functions of bounded variation, and  and  denote the Riemann-Stieltjes integral. Our results are based on a generalized fixed point theorem for weakly contractive mappings in partially ordered sets

Unique Solution of a Coupled Fractional Differential System Involving Integral Boundary Conditions from Economic Model