| | I agree that there a number of things that could be used as money because of their tangible worth. But gold is still the best and is still practical.
Steve, I have no problem with gold being one source of currency in a totally free market of currencies. If the market resulted in gold being the dominant currency, again, fine with me. But, I doubt that dominance of gold as almost the sole medium of exchange would occur, because there are various attributes that an ideal currency would have, and no currency, including gold, possesses all those attributes (a non-comprehensive list of those attributes from: http://chestofbooks.com/finance/banking/Banking-And-Currency/The-Functions-And-Attributes-Of-Money-Continued.html):
(1) Value of material;
(2) Portability;
(3) Indestructibility;
(4) Homogeneity;
(5) Divisibility;
(6) Stability of value;
(7) Cognisability.
to which I'd add an eighth quality: there must be enough of it to handle the volume of economic transactions that occur.
Thus, currencies that are good at some of these attributes are going to be less good at others. Paper money backed by some tangible commodity is light and easy to put in a wallet, but suffers from destructibility and counterfeiting problems.
Shares of stock can be particularly good at the ability to retain and even increase in value, but suffer from problems with volatility and cognisability (people being able to instantly recognize it and know what value it has compared to other currencies), not to mention transaction costs of redeeming it.
And so on. A free market of competing currencies would shake out which of these attributes are most highly prized.
Where gold falls shortest is in divisibility: it is so pricy that even a tiny coin is worth a lot, more than the amount to buy most items, much less make change. That is why coins used to be in gold, silver, and copper, to account for the various sizes of purchases. The divisibility problem could be gotten around somewhat by having credit cards that make purchases in tiny fractions of an ounce of gold, with the gold not actually changing hands for most transactions -- for example, buying a loaf of bread that is advertised for 0.XX grams of gold using a plastic card backed by gold in a vault somewhere.
Also, in a completely free market for currency, it is inevitable that competition would result in a variety of currency types -- it takes a government-enforced monopoly to enforce sticking to just one currency. In particular, I would say that really large corporations like WalMart or Starbucks would be likely to try and make shares of their stock into a form of currency, and would have the market power to make that happen. For example, WalMart would love to pay both their employees and vendors with shares of stock, and to eliminate a lot of credit card charges by accepting shares of stock from customers, either as paper or metal currency denominated in shares of stock or as credit cards. And, when buying gift cards to hand out at Christmas, which recipient wouldn't prefer cards that were backed by actual shares of stock, which makes them convertible into cash if you didn't frequent that store?
And, with the advent of computers and the internet, it is now practical to have quite a few different sources of value backing currency, since when you made a purchase the cash register or credit card swiper could instantly convert that currency into a common standard of reference like gold. For example, when I went to Canada a while back and made credit card purchases, each purchase was instantly converted from Canadian dollars to American dollars at the instantly prevailing exchange rate. When I got my credit card bill, basically every transaction had a slightly different exchange rate, which I didn't have to calculate.
Anyhow, the point of a free market in currency is to not even try to dictate what market share each potential type of currency would have, but just let the quasi-Darwinian process sort out winners and losers. I suspect that the result over time would be dozens of different stores of value, with gold being the reference currency against which they were all measured and converted.
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