The most common method used for electing presidents in the world today is the majority-runoff two-round system.

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The majority-runoff two-round system is indeed the most common method used for electing presidents in the world today. In this system, if no candidate receives a majority (50%+1) of the vote in the first round, a second round is held between the two candidates with the highest vote totals. Many countries, including France, Brazil, and South Korea, use this system for presidential elections.

The Most Common Method Used for Electing Presidents in the World