A right-wing former 'tantric sex coach' who has been compared to Donald Trump and who wants to adopt the US dollar has been elected president of Argentina in what has been described as a 'political earthquake'. 

Javier Milei, who uses a medium to communicate with his dead dog for advice on political matters, beat Argentina's Economy Minister Sergio Massa in Sunday's polarized presidential runoff dominated by the country's dire economy. 

Massa conceded before the electoral authority released results, which saw the right-wing populist Milei win some 56 percent to his rival's 44 percent with 99.4 percent of the votes counted.