Investors remain on edge as geopolitics continue to shape market trends, with Israel mulling a response to Iran while the U.S. and key allies explore further sanctions against Tehran. U.S. major averages display mixed performances as of midday trading Tuesday. The S&P 500 holds steady at 5,200 points, while blue-chip stocks outperform the broader market, and small caps experience some declines. In its April World Economic Outlook, the International Monetary Fund raised growth projections for the