It was a topsy-turvy week for the stock market — featuring jobs and inflation data, Nvidia 's $100 billion investment deal with OpenAI, and signals of stronger-than-expected new iPhone demand. The S & P 500 and Nasdaq closed at record highs Monday but then went on three-session losing streaks. The market did get a boost Friday on an in-line consumer inflation report. In the end, though, it wasn't enough to flip the weekly performance positive. For the week, the S & P 500 and Nasdaq saw losses of nearly 1% a ...