I'm kind of disappointed that this branch of the discussion died off because I've always been quite curious about the relationship between interest and inflation.
Let's say there's $10,000 "Liberty Bucks" printed by Libertarian Bank (assuming we go back in time to the days when private banks could issue their own notes), that's all the Libertarian bank notes that exist in the economy because Libertarian Bank is the only bank that can issue its notes (anything else is from "other bank"), and they loan $10,000 in Liberty Bucks to Bob on the condition that he pays back $11,000 Liberty Bucks by the end of the year. Where does that extra grand come from, if not from Libertarian Bank, and why would a bank loan money at interest, if it has to print more money to get paid back, which effectively devalues the original $10,000? I mean, think about it, why does it even work? Does interest itself inherently cause, or at least, require there to be inflation in order to work? I can't really pay you back something you loan me with interest, if what you gave me in the loan is all that exists.
It would seem to me that if you wanted a truly strong currency, you'd have to ban interest, and maybe even set fire to a few dollar bills every now and then for good measure. I mean, maybe Bob could simply shred, burn, destroy half of what he borrowed and then repay the bank $5,000 expecting to be thanked for effectively doubling the value of their currency, lol.
EDIT, Maybe it's only complicated by the existence of fiat currency backed by nothing, but it does make you wonder even more about how the people running our money system have managed to make it work when it doesn't seem to make any sense at all.
What you describe here I was going to go into and forgot. It is a "problem" of sorts, when stated in this way, and makes clear that human economies are far from perfect.
That said, some are closer to perfection than are others. The whole notion of "store of value" tends toward the arbitrary. In his sense, the architecture of the FRN system of currency is really no worse than any other. Some will bristle at this, but it stands true nevertheless.
The real problem with our economic systems, specifically with the monetary representations of value, is that they are all arbitrary. Calling gold "inherently valuable" is FAIL because it gives no context. Gold is not valuable in itself until a context is given. As food, gold is utterly valueless. Anyone doubting this, I suggest you put 10 ozt. of small gold coins in your pocket, go three days without eating, and then consume your coins in the attempt to sate your sunken-eyed desire. The result, I am confident, will be no satiation, later accompanied by a rather interesting court upon the throne, some hours later.
Shift context to electrical conductors. In the semiconductor business, gold has immense inherent value because of its immunity to corrosion and its superb conductivity properties.
By this simple example we see the central importance of context, as well as just how hollow-ringing is the sans-context assertion that says "gold is inherently valuable".
So where, then, does the FRN-based system fail? In its management, for one, which has been either inept, dishonest, or both. But the real bugger is the fact that the FRN represents no value whatsoever, but only debt. Every FRN that has been issued, save those of recent vintage at 0%, attaches with the interest to which you refer. It is, therefore, inherently a debt instrument. There is literally NOTHING backing the FRN, save people's acceptance, which I will blindly assert is insufficient to the longer term viability of the instrument.
The exact same problem, however, exists with gold. Imagine the bank issues you every last ounce of gold coin on the planet. Let us say is it 100 ozt. There are no other coins extant. The term is one year at 1% uncompounded. Therefore, when the note comes due, you must present 101 ozt of gold in payment of the debt. Where will the other ozt come from? You may find that much gold by panning for it. But if it proves not forthcoming, there is a problem and the lender may be forced into making a choice to accept other valuables in lieu of the extra ounce. This is all part of the vicissitudes of economic life and the risks that partly comprise the overhead of all human transaction. Shit happens, and there are always other commodities of value that may substitute for those specified in any given contract. That is why banks accept liens on real property when giving mortgages. It best assures they do not take it in the neck in the event the lender is unable to repay.
The whole concept of money carries several shortcomings inherent to it. Nevertheless, "proper" money remains the best we have been able to do thus far. The only deliverance from the problems of money that I can see lies in crossing some developmental threshold with our technologies. But lest one fall for the delusory notion that even Star Trek-style, talk-at-a-hole-in-the-wall-and-get-what-you-want technology would solve all man's problems, rest assured it would not. It would, however curative it proved of some of the worst troubles we currently face, give rise to a whole new host of problems. Why? Because human beings of the Empire ilk have thus far proven never to be satisfied with what they have, no matter how good. It is an adopted mindset that drives a vast number of men to always press the boundaries, which in itself has proven very much a two-edged sword. And make no mistake about it: it is LEARNED BEHAVIOR. The very environment to which Empire gives rise leads the individual toward FAIL. It is in the very nature of the arrangement that people decay from the noble potential of the newborn, to the avariciously vicious adult, covetous of all he cannot have and never satisfied with that which is at hand. It is the "he who dies with the most, wins" mentality of the lowest among us (think of men like Gates). They bring forth miracles of sorts, but ones to which there attaches great price, our individual equilibrium perhaps the greatest sacrifice of them all.
Given all this, the world is what it is, and despite the mania of humanity running amok each individual retains the potential for a life worth the living. A great determinant in that equation lies in the freedom to carve for oneself a life of prosperity as he may define it. A prime element of that equation is economic freedom and that means access to money, which in turn leads to the importance of a sound medium of exchange. It is far from perfect, but it is the best we primitive humans have been able to concoct, to date.