My top 10 things to watch Tuesday, Nov. 18 1. The S & P 500 was headed for a lower open this morning, putting the benchmark index on track for its fourth consecutive day of losses. That would be the S & P 500's longest losing streak since August. Big laggards include Club holding Nvidia , down 1% ahead of the chipmaker's third-quarter results tomorrow evening. 2. Tech-related selling has been spilling over into bitcoin . It briefly dipped below $90,000 today to its lowest levels since April, wiping out this year's gains. The world's biggest cryptocurrency has been sliding since its early October record high of more than $126,000. How much further can it fall? So many stocks depend on it. I know 20 off the top of my head. 3. There has been a lot of talk about a market correction and data ce

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