BUENOS AIRES—President Mauricio Macri got an unexpected show of support in a primary election Sunday, boosting the Argentine peso and local stocks on hopes that his government will push forward with plans to overhaul the country’s economy.

The nationwide primary, where voters cast a single ballot for their choice among a raft of candidates from each party, determines which parties are eligible to run for midterm congressional elections in October, providing an indication of voter preference ahead of the midterms.

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