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"In single-member ballots, opting for a two-round election has the main effect of encouraging coalitions between parties: “The influence of the two-round, single-member ballot on the strategies of political parties may depend as much on alliances as on the number of votes obtained”. The logic behind this type of ballot is that in the first round, each party should quantify the strength of the other parties. In the second round, these parties support those candidates best placed to win and promote their ideas. More often than not, this support is expressed by withdrawal. In multi-member systems, support may take tangible form in the merging of lists (if authorised and subject to the reaching of certain applicable thresholds). It should be noted that where alliances are possible only in a single camp – owing in particular to the influence of extreme parties or parties excluded from alliances with government parties –, the inequalities in terms of representation may prove to be particularly marked."
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