T
Tom Gardner
Guest
On 19/10/19 17:04, jlarkin@highlandsniptechnology.com wrote:
Not quite.
My point is that you can't determine the angle of repose
from considering a single grain in isolation. It emerges
when there are multiple grains.
Plus other factors, of course; sometimes the sand can
behave much like a liquid.
Amusing, but lucky timing has a lot to do with
becoming rich.
On Sat, 19 Oct 2019 08:04:02 +0100, Tom Gardner
spamjunk@blueyonder.co.uk> wrote:
On 19/10/19 03:19, jlarkin@highlandsniptechnology.com wrote:
On Sat, 19 Oct 2019 00:05:30 -0000 (UTC), Cursitor Doom
curd@notformail.com> wrote:
On Fri, 18 Oct 2019 10:19:29 -0700, John Larkin wrote:
Economists, like any other market commodity, are for sale.
That is *so* true. And I've learned over many decades that whenever I
hear a newsreader announce, "a panel of 34 eminent economists all agree
that [insert claim of choice here]" I know they've been hired to say it
and whatever they're predicting will simply *not* come to pass. I've seen
it over and over and over and over again.
"If you want ten opinions on an economic issue, ask five economists."
Ditto engineers, if they are any good and include a "it
depends on whether..." caveat.
But we build stuff and, if it doesn't work, pay consequences.
They write papers and do calculus and win Nobel prizes for their
theories. But macroeconomists can't experiment to test their theories.
And their predictions are miserably, uselessly predictive. So their
world is all about concensus and fad and politics. Group, tribal
delusion.
Lots of "sciences" are like that.
Not just economics, unfortunately.
Concensus is not reality. The fuzzy "sciences" wander all over the
place, about once a generation on average, but do tend to converge on
self-interest.
That's captured in the very old semi-serious joke, probably
in the excellent "A Random Walk in Science" or its successor.
A physics student meets his professor in a corridor and asks
him to explain an experimental graph. The professor confidently
gives an explanation.
The student notes the professor is holding it upside down,
and rectifies that. The professor confidently gives another
explanation.
Microeconomics is subject to experiment. But hardly anybody wants to
be a microeconomist, and they don't get much glory. Economists want to
turn the big knobs.
The unavoidable problem is that they can never repeat an experiment, since the
conditions will have changed.
That's ironic, because macroeconomics is just the sum of all
microeconomics.
Not necessarily; emergent phenomena scupper that hope.
The physics of a pile of sand is not the physics of an
individual grain. If you can locate where the 35degree
half-angle of a pile of sand is encoded in an individual
grain of sand, you would win awards.
To make a useful predictive model of a pile of sand, you have to
understand the grains. Smooth round sand grains will stack differently
from irregular jaggy ones. A simulation or math analysis must start
with grain behavior. Even experiments have to control for grain
characteristics.
Not quite.
My point is that you can't determine the angle of repose
from considering a single grain in isolation. It emerges
when there are multiple grains.
Plus other factors, of course; sometimes the sand can
behave much like a liquid.
None of that implies I have too much faith in economists,
but I would prefer to blame them for things that are
their fault.
"If you're an economist, how come you ain't rich?"
Amusing, but lucky timing has a lot to do with
becoming rich.