What kind of theory of the world insists that houses and stocks always go up in price, whereas gas and grain prices always go down? That doesn’t really make sense. A price is not set by natural law, nor are price movements intended to follow a preset pattern like the movements of stars. Prices are nothing but exchange ratios — points of agreement between buyer and seller. They reflect many factors, none of them fixed parts of the universe.
So why do we expect some to rise and some to fall? It all depends on whether you are in the position of a producer or a consumer. As homeowners, we are in fact “producers” of our homes; that is to say, we are holding them with the expectation of someday offering them for sale. The same is true of our stocks. We already own them, so of course we want the price to go up. Then we can sell them at a profit.
On the other hand, on things we intend to buy, things like gas and grain, we want the price to be as low as possible. We want their prices to fall. That way we save resources.
So what’s at work here is self-interest. Think of the same situation from the point of view of someone who is a first-time homebuyer. Does this person want high prices or low prices? Of course the answer is obvious. This person wants the lowest price possible, so for this person this “housing bust” is not a bust at all. It is a boon. But once this person becomes a homeowner, matters change. Now he wants prices to rise.
Now think of the gas station owner. If it didn’t affect how much he sold, would this person want prices to rise or fall? Of course, he wants the highest prices possible.
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It’s the same in all markets. We can see that it is perfectly absurd to attempt to fashion national policy around the interests of only one party to an exchange. To try to keep house prices high and rising cheats the first-time buyer. To keep them low cheats the current owner. To keep grain prices high helps grain producers but hurts grain consumers. Some gas companies might like high gas prices, but consumers hate them. On the other hand, gas prices forced lower by dictate might thrill consumers but producers might end up hurting so much that they shut down. That helps no one.
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There is no way to observe an existing price and declare it just or unjust. As St. Bernardino — a shrewd observer of economic affairs — said,
Water is usually cheap where it is abundant. But it can happen that on a mountain or in another place, water is scarce, not abundant. It may well happen that water is more highly esteemed than gold, because gold is more abundant in this place than water.
The Late Scholastics, followers of St. Thomas Aquinas, all agreed that the just price has no fixed position. It all depends on the common estimation of traders. Luis de Molina summed up the point:
A price is considered just or unjust not because of the nature of the things themselves — this would lead us to value them according to their nobility or perfection — but due to their ability to serve human utility. But this is the way in which they are appreciated by men, they therefore command a price in the market and in exchanges.
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Now, there are ways for a price to become a matter of injustice. It can mask fraud. The prices can result from or be influenced by some act of force, such as price controls or taxation or restrictions on supply and demand. Behind each of these, we find coercion, a body of people who are mandating or restricting in a way that is incompatible with free choice. Arguably, this is not just.
We can conclude, then, that to the extent we complain about unjust gasoline prices, we need to look at the restrictions on refineries or exploration or drilling, or examine the role that high gas taxes have in pushing up prices beyond what they would be under conditions of free exchange.
And as for those who believe that all prices should move in ways that benefit their own particular economic interests at the expense of everyone else, don’t confuse your agenda with a matter of justice. […]