My top 10 things to watch Wednesday, Nov. 19 1. The S & P 500 was headed for a higher open this morning as the index attempts to break its four-session losing streak. The Nasdaq , which has been down five out of the last six trading days, was also expected to open higher. Concerns about AI-related valuations continued to pressure megacap tech shares yesterday. Tonight, Nvidia's quarterly earnings report will be in focus. 2. It's Nvidia Day. When everyone is worried about something, then it isn't as cataclysmic as when you are surprised about something. Nvidia is now perceived as the only taker in this entire market of AI situations. Nvidia CEO Jensen Huang will explain this evening why a company that buys chips sees a four times gain on those chips. After all, people think it's the only on

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