Analyzing heterogeneous effects: How competition by informal firms affects firms’ productivity in Nicaragua. REICE: Revista Electrónica de Investigación en Ciencias Económicas, [S. l.], p. 131–183, 2024. DOI: 10.5377/reice.v1i2.18870. Disponível em: https://revistas.unan.edu.ni/index.php/reice/article/view/4555. Acesso em: 9 aug. 2025.