looks like accum/dist is in millions of shares and runs off volume, buys and sells. So, if the indicator goes above zero, the selling dries up which means less flipping, and more holding. Also, the indicator goes above zero during the last run to .05. So, it's a good indicator to see if history repeats itself, ie if we get above zero, maybe buying and holding will propel the price up again. It looks very reliable and also would be a blast if the indicator predicted another run. imo.
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