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Already submitted twice before, most recently here:

http://news.ycombinator.com/item?id=863344

A little background on the author in this comment:

http://news.ycombinator.com/item?id=863705

I'm curious, as I have only recently started contributing here -- how tolerant is HN with reposts?
(comment deleted)
As far as I understand, unless they are years apart or circumstances have changed remarkably enough to warrant a new discussion on the same topic, reposts are generally avoided. In the cases where a repost is warranted, a comment with a link to the old discussion would be appreciated.
When it takes the form of hoarding, the link between saving and promoting economic activity is broken, or at least frayed.

Hate to comment on something submitted so many times, but the above use of "hoarding" no longer applies. There was a time when people actually took physical money or gold and hoarded it...hid it away. With the gold standard, this amounted to a drop in the money supply. Such deflation has well-understood problems. It isn't possible now. When you "hoard" money in your BAC account, BAC loans it out at anywhere from 5 to 25 percent interest and life goes on. This isn't the 1930s.

He did mention hiding money in your mattress. I'm not sure why you think hoarding cash is somehow impossible now?
How many people actually hoard money in the mattress, seriously?
Few, I'm sure. "Impossible" is a very strong claim. :)
Everyone here who fancies themselves as an economic pundit seriously needs to read Economics in One Lesson:

"“Saving,” in short, in the modem world, is only another form of spending. The usual difference is that the money is turned over to someone else to spend on means to increase production. So far as giving employment is concerned, Benjamin’s “saving” and spending combined give as much as Alvin’s spending alone, and put as much money in circulation. The chief difference is that the employment provided by Alvin’s spending can be seen by anyone with one eye; but it is necessary to look a little more carefully, and to think a moment, to recognize that every dollar of Benjamin’s saving gives as much employment as every dollar that Alvin throws around."

http://jim.com/econ/chap24p1.html

That's not completely true.

Spending increases the velocity of money ( http://en.wikipedia.org/wiki/Velocity_of_money ) which can, in the short term, increase employment.

Saving/investment also increases employment as the borrowers use it to increase their capital (buy more machinery etc), which needs extra employment.
Your view is also antiquidated. Banking is moving target, the technicalities of the reserve system change frequently.

In modern banking the act of depositing is completely severed from the act of lending. Banks lend based on capital ratios, availability of borrowers, and the Fed's interest rates. Deposits and reserves no longer matter.

Effectively, when you deposit money, you deposit in a 100% reserve account with the Fed. The Fed as a completely separate action lends money to the banks.

Thus last year when people panicked and decided to hoard more, the result was deflation, (not lower interest rates on business loans and mortgages as your model would predict).

For further reading: http://www.winterspeak.com/2009/09/loans-create-deposits-how...

http://www.moslereconomics.com/mandatory-readings/soft-curre...

http://reservedplace.blogspot.com/2009/04/easing-understandi...

And the comment thread between RebelEconomist and JKH here: http://blogs.cfr.org/setser/2007/05/11/rising-deficit-in-the...

These folks actually work in banking, and make their living understanding how the system works. They are very much worth reading.

No, it still does apply. The problem is that when everyone (or at least a lot of people) hoards, it drives down aggregate demand. Demand doesn't magically appear from nowhere. Who are the banks going to lend to when no one's buying or selling? When businesses and individuals both hoard money, there's just less business to be done. You may have read stories of banks not lending despite the injections of cash into the system! What do you do when that happens?

The problem with the hoarding scenario is that if you know that a greater than X percent of people are hoarding, then you better too because the economy will do worse for it, and you better have a hedge when that happens. This is called a deflationary spiral.

With fiat currency, the central banks can attempt to discourage hoarding by printing money. However, the amount of money destroyed by the recent financial crash has nearly outpaced the Fed's ability to print money.

It's funny to hear people refer to themselves as Keynesian, Neo-classical, or even Austrian like one school actually has all or even most of the answers. It's more than possible that current economic theory is much like current physics in that there are many theories that work part of the time (quantum physics vs. relatively) but universal theories elude us. I'd doubt there's a physicist who's only a Quantumist...