News broke that Pfizer had developed a promising vaccine that was 90% effective in the trial phase, an announcement that sent theater stocks surging on the prospect that the world could be returning to some sort of normal within months. Moderna followed a week later with news that preliminary results showed its vaccine was 94.5% effective.“It’s a huge game changer,” says Alejandro Ramírez Magaña, CEO of Cinepolis, the biggest chain in Latin America and one of the largest in the world.