Silva Junior, José Alexandre daMorais, Leonardo RodriguesParanhos, RanulfoLima, Albany FerreiraTribunal Superior Eleitoral2021-08-202021-08-202020SILVA JUNIOR, José Alexandre da et al. The presence of incumbents electoral competition and reelection in Brazil (1990-2014). Brazilian Political Science Review, São Paulo, v. 14, n. 1, p. 1-36, 2020. DOI: http://doi.org/ 10.1590/1981-3821202000010003.http://bibliotecadigital.tse.jus.br/handle/bdtse/9090What are the effects of attempts at reelection on electoral competition? It has tested the assumption that attempts at reelection have a positive and significant effect on electoral competition. It measured electoral competition using two indicators: Imbalance index T (Taagepera) and generalized concentration index (Herfindahl-Hirscham (HH)). It analyzed data on the seven last Brazilian national elections (1990-2014). It employed descriptive (variable measures and times series) and inferential statistics (regression analysis with panel data). The main findings: 01. the percentage and the concentration of incumbents has a significant and negative effect on the concentration of votes; 02. the interaction between the percentage of incumbents in a given dispute and in a coalition has a significant and positive effect on the concentration of votes.36 p.enCreative Commons Atribuição-CompartilhaIgual 4.0 Internacionalhttp://creativecommons.org/licenses/by-sa/4.0/Sistema eleitoralEleiçãoReeleiçãoBrasilArtigo