The purchasing power of money is, indeed, a function of both supply and demand and the demand-side is the most overlooked part of the theory of money.
Demand for money is better termed “demand for cash balances” or “demand for cash held”.
The problem with printing money - as Dave pointed out - is not that it “hurts someone”… after all, starting a new retail store “hurts” all other retailers in your area. The problem is that it is stealing by any other name. This is a difficult point to force a statist to concede because he/she does not believe that taxation is theft, so why should any other form of government-administered redistribution be called theft? In any case, the Austrian theory is value-free so it only makes the weaker claim that increasing the money supply is redistributive.
Changes in demand for money can have massive effects on the purchasing power of money. In fact, hyper-inflation is actually caused by a collapse in the demand for money. The absurd printing of money is just a reflection of the fact that the demand has collapsed.
When a saver’s demand for money decreases and he begins to spend, he is acting like a central bank in that he is “flooding the economy” with new cash. Unless lots of people are doing this simultaneously (as in a hyper-inflation scenario), this has no effect on prices because an individual simply doesn’t have the power of a central bank to move prices.
But - as Dave pointed out - this “flooding” of the economy had to be preceded by a period of over-production and under-consumption in order for the cash balance to be built in the first place. Hence, there is no theft going on here and, to whatever extent someone could claim to be “harmed” by the rise in prices, this is no different than the kind of “harm” that local retailers suffer when you open a new retail outlet in your area. A claim could be made that such movements of cash - if calculated based on the going purchasing power of cash - are “redistributive” but - if so - they are redistributive only in the sense that any form of speculation is. The social benefits of speculation are well understood in economic theory.
Now, on to hoarding. First of all, no one actually hoards in the sense that they bury cash and forget it ever existed. There are many reasons people save - to buy something that is very expensive (this is just deferred consumption), to self-insure against unforeseen maladies, to build a family legacy through inheritance, to prepare for a very large investment or charitable endowment, etc. etc. But the one thing people never do with money is bury it and forget it which is the only way that the arguments against the broken window fallacy would actually make sense.
What is really at stake is whether the decision-making power regarding the saver’s savings should reside with the saver himself or the would-be central-planner. The central-planner doesn’t like that the saver is taking too long to spend his savings… he should not be saving for a yacht and should be forced to buy new windows for his shop instead. So let’s throw bricks through the windows. And - I would argue - on the grand scale, the real target is inheritance. People don’t like the idea of inheritance, they feel that it is somehow unfair. This is why we have the death tax. But, as with all central-planning, the effect is always a discoordination of the economy as the decision-makers have less and less of the relevant information and the calculation of decisions is concentrated into fewer and fewer brains.
So, hidden within the broken window fallacy is the core of the central-planning versus laissez-faire debate. The brick-throwing central-planner simply believes he knows better than all those individual savers whose windows he plans to break. Reality says the central-planner is incorrect.
Clayton -