International audienceThis paper examines how preferential credit based on retailers' credit line impacts on capital-constraint retailer's operational decisions. We consider a condition of loan competition when banks and manufacturers offer preferential credit to capital-constraint retailers in the newsvendor model. Different credit lines and discounted rates of preferential credit mainly involve in retailers' exogenous collateral and risk preference of banks and manufacturers in our model. We investigate impacts of bank financing, trade credit, and portfolio credit (financing from both bank credit and trade credit with different ratios) on retailer's inventory decision with different cases that the retailer's financing amounts exceed credi...