Spanish Abstract: Este articulo aborda la aplicacion de la buena fe y el principio de la solidaridad a traves de la revision del ordenamiento juridico italiano y ecuatoriano. En ese sentido, se examina su funcion en el actual contexto pandemico originado por la covid-19. Sobre todo, se destaca como la buena fe y la solidaridad podrian utilizarse para afrontar “comportamientos abusivos”, como el aumento —irracional— de los precios de mascarillas y otros instrumentos de proteccion frente al virus. English Abstract: This article addresses the application of good faith and the principle of solidarity through the analysis of the Italian and Ecuadorian legal system. In this perspective, its role in the current pademic context caused by COVID-19 is examined. Above all, it highlights how good faith and solidarity could be used to address ‘abusive behaviors’, such as the irrational increase of the prices of masks and other personal protection equipment against the virus.