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Buyers jumped on board the Wilshire 5000 index once it broke resistance in the left chart above, which was a positive for this very broad index, pushing it almost vertical on this chart.
Now another broad index is attempting a breakout. The NYSE is now back at the top of its multi-year sideways trend channel in the upper right chart.
Should a breakout take place, odds are high that buyers will jump on it like they did the Wilshire breakout.