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Dr Richard CB Johnsson's avatar

How are prices determined? Is it cost of production or utility, marginal cost or marginal utility? The by far best writings on this topic have originally been provided by Carl Menger and Eugen von Böhm-Bawerk. Menger was the founder of the so-called Austrian School of Economics and also of the theory of marginal utility, a theory he published independently the same year 1871 as Walras and Jevons.

The basic idea is two or more buyers on the one side, and two or more sellers on the other side. The buyers tend to bid up prices towards their individual perceived utilities (objective or subjective) as they compete at getting the good or service at hand, while the sellers tends to bid down the price towards their cost for the good or service. Since it’s not the average seller or buyer that finally determines the price, but rather the people acting on the margin, we can refer to these buyer and sellers as marginal pairs and note that it’s the marginal utility and marginal cost that’s involved, not the averages.

Now, if there is only one buyer there might be very little of bidding up the price, and if there’s only one seller, there might be very little of bidding down the price. In most real-life situations there often is an element of buyer or seller power influencing the price determination.

One thing that I think few people can answer is how the (marginal) cost itself is determined. This is where Eugen von Böhm-Bawerk enters the picture. He wrote extensively on this, and it’s very clear and easy to follow. In his essay Value, Cost, and Marginal Utility, he has a chapter called ‘Which Is “More Ultimate,” Costs or Marginal Utility?’ that deals with this. The basic idea is that the marginal utility of a good or service to the seller also affects whether the price is bid down by sellers. The raw materials etc involved often have an alternative use that also plays a role in this. For example, we cannot drive a car without a steering wheel, so the utility of the steering wheel must make the price of it very high, right? Not really, since the marginal utility of the seller of steering wheels of this particular marginal steering wheel is very low. The seller likely has thousands of it, and perhaps even wouldn’t miss it if it was stolen or lost from inventories. However, the seller isn’t prepared to sell it at the price of zero, since he has bought inputs like plastics to make it. So how much is this plastic worth? Well, it depends on all the other potential uses of such plastics and the marginal pairs involved in determining the price of the marginal potential other uses. In practice, the seller of steering wheels often just takes the price of plastics for granted and puts the price at the marginal cost plus a mark-up to earn something. Nevertheless, there’s more to it than meets the eye, as Böhm-Bawerk explains to us so well.

It should be noted, that there’s very little about this in standard text books about economics. But understanding marginal pairs is important for many reasons, like for example bid-ask-spreads when trading stocks.

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Gilgamech's avatar

An excellent starting point. I will be following this series keenly.

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