> Angle of repose.

That's the one.  Thank you very much.

> Angle of subsidence is a popular usage variant but
> doesn't appear in Wikipedia...

Yes, I had observed that it didn't

> ...and seems to be a conflation with terms from mining, "angle of
> draw" being a term used in describing surface subsidence resulting
> from collapsing mine caverns below.

Yeah, I found a bunch of stuff about that, obviously the wrong stuff.
I've heard Angle of Cascade as well.  That seems to refer, properly
speaking, to phase angle in some electrical phenomenon.

I get to observe the phenomenon annually as I split my firewood.  It's
desireable to keep the pile of split pieces on as small a footprint as
possible because the ones on the bottom get pressed into the dirt and
have to be laid out to dry in the sun as the last of the pile is being
moved to the wood shed.  So I toss split pieces on top of the pile
which repeatedly grows quite tall and steep before cascading suddenly
to a lower angle.

It's admittedly rather stretching the metaphor to apply it to the
power pyramid of megalomaniacs, greed-heads and so on.  Noodling
around with it, though, one might liken a market panic to a sudden
decline in coefficient of friction between bits of piled granular
stuff. That leads to speculation on the possibility of market
thixotropy. 8-)


Tnx,
- Mike

-- 
Michael Spencer                  Nova Scotia, Canada       .~. 
                                                           /V\ 
[email protected]                                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^
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