Nanostores are a vital segment of the Peruvian retail ecosystem; however, their operational inefficiencies, particularly in inventory management, limit their commercial development. This study investigates the causal Relationship between inventory management and sales performance in nanostores in Lima, using Structural Equation Models (SEM). A quantitative and explanatory design was employed, with data collected from 220 store owners through validated surveys. The analysis, conducted with SPSS and ADANCO, revealed that inventory management has a significant influence on sales results. Additionally, supplier management has direct and indirect effects through inventory and procurement practices. Although some indicators showed low factor loads, the overall model demonstrated an acceptable fit and explanatory power (R² = 0.526 for the Impact on sales). The findings suggest that bolstering supplier and inventory management strategies can improve sales performance and competitiveness in small-scale retail. This study is novel in its application of SEM to nanostores in a Latin American context, making methodological and practical contributions to the literature on supply chain efficiency in microenterprises.