Lula and Bolsonaro offer competing visions for investment in critical minerals Brazilian presidential candidates Flavio Bolsonaro, left, and incumbent Luiz Inacio Lula…

Lula and Bolsonaro offer competing visions for investment in critical minerals Brazilian presidential candidates Flavio Bolsonaro, left, and incumbent Luiz Inacio Lula da Silva take part in a debate in Sao Paulo on Oct. 18, ahead of the runoff vote. © Reuters WASHINGTON/CANBERRA -- The result of Brazil's presidential runoff on Sunday will not only decide the country's next leader but also impact how -- and how quickly -- the country develops its massive, largely untapped reserves of rare earths.