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But as a Nabisco route salesman, a good old Southern boy I once knew, used to love to say even after he had risen high in the biscuit hierarchy: "The sun don't shine on the same dog's ass all the time."

NYSE (daily) Advance / Decline Line (ADL)  

New York Stock Exchange Advance Decline Line
(Cumulative Daily Breadth) blue, 20 day exponential average red, the green line is a 20 day Donchian channel.
This chart is generated by subtracting the NYSE Composite declines from that days advances. The blue line plots the cumulative total.