El objetivo principal de este trabajo es analizar el fenómeno de la formación y éxito de nuevos partidos en el período de redemocratización y retorno del multipartidismo brasileño (1979-2018). Aunque el fenómeno es recurrente en Brasil, pocos estudios han analizado el tema de forma más directa en este país. ¿Cuáles son los determinantes de la formación continua de nuevos partidos? Nuestras hipótesis son que la permisividad del sistema electoral pierde efecto cuando los actores se adaptan a él y que factores endógenos a la competencia política aumentan la probabilidad de que surjan nuevos partidos. Utilizamos metodologías previas y conceptualizamos a los partidos nuevos como aquellos que son organizativamente nuevos (obtienen un nuevo registro) y ganan al menos un escaño en la Cámara de Diputados. Dividimos a los partidos en partidos de contestación o de coaptación para evaluar el impacto de las variables institucionales y económicas sobre ellos. Nuestros resultados indican que los partidos que están totalmente "fuera del sistema" (los partidos de contestación) tienen más dificultades para ser competitivos, lo que demuestra que el fenómeno de la aparición de nuevas siglas está más vinculado a una reorganización estratégica de las élites que a una demanda de los votantes.
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