When Argentine President Mauricio Macri needed a place to sell his vision for reviving his country’s economy, he chose the Buenos Aires offices of MercadoLibre Inc., Latin America’s largest online marketplace.

By his side was the company’s 45-year-old founder and chief executive officer, Marcos Galperin, who used the August event to reveal plans for a $100 million investment that he said will create 5,000 new jobs in the region. The announcement came as he was unveiling a 355,000 square-foot office in Sao Paulo equipped with a massage room, ping-pong tables and a solar panel rooftop.