Mexican President Enrique Pena Nieto on Monday raised his goal for infrastructure spending to 7.7 trillion pesos ($587 billion) by 2018, in a bid to boost growth in Latin America's number 2 economy. The new target, which includes both public and private investment, is nearly twice the 4 trillion peso goal announced by Pena Nieto last July for his term in office, which ends in four years. "With bigger and better infrastructure, there are more oppo…