Stocks finished higher Friday, lifted by the volatile artificial intelligence trade, leading the market to the upside for the week. The S & P 500 eked out a 0.1% weekly gain, while the Nasdaq gained 0.5%. While logging three positive weeks in the past four, the indexes were still modestly lower for the seasonally strong month of December. It was anxiety over AI funding issues on Oracle 's data center projects and broader concerns about the levels of AI-related spending that kept investors guessing lately. . ...