Peru heads into a knife-edge presidential runoff on Sunday after Keiko Fujimori and Roberto Sánchez held their closing rallies and the country entered its pre-vote quiet period.

Peru's presidential election has begun to weigh on business and investor confidence ahead of the June 7 runoff between Keiko Fujimori

Peru's presidential candidates, conservative Keiko Fujimori and leftist Roberto Sánchez, closed their campaigns in Lima on Thursday before thousands of supporters, three days…