Peruvians are heading to the polls on Sunday in what is expected to be a tight presidential runoff, with the model behind one of Latin America’s most stable economies at stake.

Voters will decide whether they finally give a shot to three-time runner-up Keiko Fujimori, a conservative seen as the guarantor of a successful economic model instituted in the 1990s under her father’s presidency but also the heiress to his polarizing administration. The alternative is leftist lawmaker Roberto Sanchez, who wants to overhaul Peru’s market-friendly constitution to redistribute wealth more fairly, particularly when it comes to the country’s critical mining industry.

The winner will begin a five-year term on July 28.