Exactly.- the breadth keeps narrowing .
Thing is, that makes it easier to take one or the other higher on any given day.
I've written this before in another thread, and I'm not sure why he chose that member ID, but "buy1sell2" is a brilliant name, and its exactly what's going on.
You run "whatever" up when the dom is light, as the momentum catches on and/or the shorts start covering, you not only sell the shares it took to run it up, you sell the shares you've been sitting on also because what was a previously moribund buy side.... suddenly emerges in a big way.
Buy one, sell two.
There's nothing new under the sun.