The value of things does not exist in the things themselves. It is always human beings who assign value.
The Subjective Theory of Value is an economic theory stating that the value of goods does not arise from the properties of the goods themselves, but from the subjective judgment of the individuals evaluating them. It was systematized by Carl Menger, founder of the Austrian School of Economics, in his 1871 work "Principles of Economics" (Grundsätze der Volkswirtschaftslehre), and this was one of the most important turning points in the history of economics.
The core proposition is this: The value of a glass of water does not lie in the water itself. It lies in the situation, needs, and preferences of the person drinking it.
To understand the Subjective Theory of Value, we must first examine the theory it replaced.
Beginning with Adam Smith, developed through David Ricardo, and taken to extremes by Karl Marx, the Labor Theory of Value asserts:
The value of goods is determined by the quantity of labor invested in producing them.
According to this theory, a chair made with 10 hours of labor should be worth twice as much as a chair made with 5 hours of labor.
Marx took this further and derived the theory of surplus value-the logic that capitalists "exploit" the difference between the value created by workers and the wages they receive. This became the theoretical foundation for communist revolution.
Although the Labor Theory of Value appears intuitively plausible, it collides with obvious problems in reality.
Example 1: Someone spent 100 hours creating a sculpture from clay. No one wants it. According to the Labor Theory of Value, this sculpture should have high value, but its actual market price is zero.
Example 2: A seashell found by chance on a beach, if it is a rare collectible, can have a value of millions of won despite zero labor invested in it.
Example 3: Two loaves of bread made with identical labor-one freshly baked and hot, the other three days old-will have completely different values assigned by consumers.
The Labor Theory of Value cannot explain these phenomena. It is not the input (labor) but the outcome (consumer evaluation) that determines value.
In 1871, Carl Menger fundamentally solved this problem. That same year, William Jevons in England independently reached similar conclusions, and in 1874, Léon Walras in France followed. Menger's insights can be summarized in three points.
Different people assign different values to the same object. For a vegan, the value of a steak is near zero, but for someone who loves meat, it has high value. The objective properties of the object have not changed, but the subject evaluating its value is different.
A glass of water in a desert versus a glass of water in a city. The chemical properties of water are identical, but for a dehydrated person in the desert, a glass of water can be worth more than their entire fortune. Meanwhile, in a city where water comes from a tap, a glass of water is worth almost nothing.
Value is not inherent in the water itself. Value emerges in the specific context where goods meet human needs.
This develops into the theory of marginal utility. Value is determined not by total quantity but by the last unit (the marginal unit). This insight resolved the ages-old economic puzzle known as the "water-diamond paradox."
The Subjective Theory of Value explains how prices are formed. Price is not a reflection of some "objective value" inherent in goods. Price is the result of numerous individuals' subjective evaluations meeting in the market.
The seller values money more highly than the goods they possess, and the buyer values the goods more highly than money. Since both parties benefit, the transaction occurs. This is why free trade always benefits both parties.
The Subjective Theory of Value is the theoretical foundation for the economic calculation problem. If value is subjective, then in principle it is impossible for a central planner to calculate "correct prices."
Millions of people, in different circumstances with different preferences, constantly make changing value judgments. No committee or computer exists that can collect and synthesize all this information to derive "accurate" prices.
This is why the Soviet planned economy suffered simultaneously from chronic shortages and surpluses. Even if central planners decided "the fair price for these shoes is 30 rubles," there was no way to know whether enough consumers actually valued the shoes at 30 rubles.
The Subjective Theory of Value fundamentally refutes Marx's theory of exploitation. This is because the value of labor is also subjective.
An employment contract is a voluntary exchange where both parties' subjective valuations meet. Workers value wages more highly than their time, and employers value workers' contributions more highly than wages. It is not "exploitation" but an exchange that benefits both parties.
The Subjective Theory of Value is not abstract theory but the reality we experience daily.
Critics of Bitcoin often say "Bitcoin has no intrinsic value." From the perspective of Subjective Theory of Value, this criticism is meaningless. No goods possess intrinsic value. Gold, dollars, and food all have value only because humans assign value to them.
Bitcoin's value is the sum of subjective valuations millions of people assign to a digital currency that is censorship-resistant, seizure-resistant, and has a fixed supply.