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Assessment: The market continues to grind higher, but the volume has been quite pathetic and well below average. It gives me the feel that this whole rally is a house of cards and when it collapses it will be a very rapid and sharp collapse. However, it is tough to fight the trend. The better idea is to wait until a key support is broken (like the previous high of $564) and then I might think about expanding a short position.
SPY Chart: https://sblk.io/s/N7nRC3UohGTPHxE
Good luck in your trades!