A tale of bitcoins and $500 suits: Will a rising-value currency not be used?

A common objection to bitcoin is that as its value rises, and especially if it is generally expected to keep rising due to its restricted and inelastic production characteristics, “people will never spend bitcoins; they will just hold onto them waiting for the value to go up, and therefore bitcoin cannot succeed as a currency.”

This fallacy commits a number of errors of economic reasoning. For example, it takes one factor, a presumed desire to save bitcoin in the expectation that its exchange value will rise still higher in the future, and treats it as the only factor, even though many others are also in play. It also assumes that all people are the same all the time and that their value scales never change. It treats a person’s entire holding of bitcoin as an indivisible block, or “hoard” (Smaug’s?), ignoring the possibility of marginal decisions about the use of smaller amounts relative to a total balance and specific decision contexts.

Playing directly opposite this supposedly monolithic motivation to hold for the indefinite future is the shift in valuations of a good relative to the value of a given bitcoin holding. As the exchange value per unit rises, the total exchange value of any given holding rises with it. To illustrate how this factor goes directly against the deflationary disuse story, here is a tale of bitcoins and $500 suits.

If Hayek has 100 bitcoins when the bitcoin price is $5, buying one $500 suit would leave him with one suit and no bitcoin. However, the same purchase with bitcoin at $50 would leave him with one suit plus a remaining balance of $4,500 worth of bitcoin. At $500 per bitcoin, he could get the suit and still keep a bitcoin balance worth $49,500. And so the story goes. Finally, at $5,000 per bitcoin, he could buy that same suit and still retain $499,500 worth of bitcoin.

The trade-off Hayek faces between the suit and the proportion of a given bitcoin holding that must be traded to obtain it varies with exchange value. As bitcoin’s exchange value rises (supposedly its fatal flaw as a currency), the cost of the same one suit as a percentage of Hayek’s total bitcoin holding declines, in the foregoing example, from 100% to 10% to 1% to 0.1%, as a direct implication. The choice between buying a suit with 100% of one’s bitcoin balance or with 0.1% of that same bitcoin balance is most dissimilar and it should be clear which of these two conditions is more likely to “stimulate” a retail purchase.

As the value of bitcoin rises, the position of one suit relative to a given unit of bitcoin on a given person’s value scale will tend to change in such a way that the same holder of 100 bitcoins might be increasingly likely, not less, to purchase a suit. This does not mean that other countervailing factors, such as a desire to delay spending in anticipation of a higher future exchange value are not also present. It means that the most oft-cited factor is not the only one and moreover that other important factors point in exactly the opposite direction of the deflationary disuse thesis.

Cross-posted at actiontheory.liberty.me.