Subjective Value Theory treats economic value as a judgment of an available good’s importance for satisfying needs. It is neither a substance inside an object nor one shared scale for everyone; valuation depends on the person, circumstances and available alternatives.
A bottle of water can matter differently to a thirsty walker and someone beside a working tap. Its chemistry stays the same while needs and substitutes change. Subjective value therefore cannot be read off the object independently of a person and their circumstances. [Menger — Principles of Economics, III–V]
A unique object need not be valued if nobody sees it serving their ends. Nor does a category’s great usefulness automatically give one available unit high value. Menger connects needs, quantities and command over goods; calling something “scarce” does not replace that relationship. [Menger — Principles of Economics, III–V]
A decision rarely pits all water against all diamonds. It concerns a particular unit and the satisfaction surrendered with it. Marginal Utility develops this point: the importance of an additional or lost unit depends on the stock and its uses, not only the category’s overall importance. [Menger — Principles of Economics, III–V] [Mises — Human Action, XI]
A buyer may prefer the good to the money paid, with the seller preferring the reverse. The agreed price is a shared exchange ratio, not proof of identical inner judgments. Both may expect improvement, but expected gains do not guarantee satisfaction after defects or changed circumstances become known. [Menger — Principles of Economics, III–V] [Mises — Human Action, XVI]
An account in currency allows monetary costs and revenues to be added. Paying twice as much does not establish twice the satisfaction, nor does an identical price imply equal benefit for two people. In Mises’s account, subjective rankings and monetary calculation must remain distinct. [Mises — Human Action, XI]
Lengthy production alone cannot make a customer want the product. Costs nevertheless matter: they affect production possibilities, supply and whether to continue. Input valuations also depend on the output’s expected use; subjective value does not mean prices can be explained without costs and constraints. [Menger — Principles of Economics, III–V] [Mises — Human Action, XVI]
People judge with knowledge and expectations that may prove mistaken. Physical properties, availability and budgets constrain attainable ends even though people perform the valuation. Explaining why someone wanted a good is also neither moral endorsement of their goal nor confirmation of an advertising promise. [Menger — Principles of Economics, III–V]
Different people may value transferability, self-custody or future exchange opportunities differently. These possible reasons establish neither a specific BTC price nor certain appreciation. Explaining actual markets requires evidence about supply, demand and constraints; value theory alone verifies neither an individual motive nor an investment forecast. [Mises — Human Action, XI] [Mises — Human Action, XVI]
For the clearest picture, read this entry together with Marginal Utility, Ordinal Utility, Carl Menger, Catallactics, Opportunity Cost. The reverse links also lead from Monetary Premium, Methodological Individualism, Marginal Utility, Ordinal Utility.