MEXICO CITY — Education officials and a teachers union on Friday blasted a recent study that found that several Mexican teachers earn more than the country’s president, saying it lacks veracity and contains mistakes. “The analysis ... lacks seriousness and rigor,” said Deputy Education Secretary Enrique del Val Blanco. The report published Wednesday by the Mexican Institute for Competitiveness, a private organization that analyses public policies, found that at least 70 teachers earn more than $15,000 (193,000 pesos) monthly, President Enrique Pena Nieto’ monthly salary. :snip: Del Val Blanco said the institute misunderstood the information and pointed out the teachers...