It takes years to build up the financial savvy to navigate the markets. But Sofia Diaz of Miami Lakes is decades ahead of the game, having just becoming the first place Florida state winner in the SIFMA Foundation’s InvestWrite® essay competition with McGraw Hill Financial. The young Diaz, a seventh-grader at Miami Lakes K-8 Center, was among the 20,000 students nationwide who took the InvestWrite challenge, and claimed her...