On top of security, immigration and the green transition, Mexico's President-elect Claudia Sheinbaum is facing a host of economic challenges. In this year's budget, Mexico's public deficit stands at 5.9 percent, the largest in decades. Plus, as she seeks to cut spending, Sheinbaum will have to decide what to do with Pemex, the world's most indebted oil company, which has become a drag on public finances. We take a closer look.