Subjective Value Theory

Near the end of a long hike, Eva runs out of water. A bottle at a kiosk would let her quench her thirst, so she wants it. At home, with drinking water from the tap, she might have no interest in that same bottle. Its chemical composition has not changed; her need and access to a substitute have. In Principles of Economics, Menger explains value through this relationship between a person, a need and the ability to use a good. “Subjective” means that someone in particular does the valuing. It does not make water’s properties or its ability to quench thirst imaginary. [1]

Eva might bring home an oddly twisted twig with no exact duplicate. That does not make it an expensive collectible. Someone must see a reason to want it. Scarcity matters economically in relation to needs and available quantities, not simply the number of existing objects. Usefulness alone does not determine price either: air is essential, but we normally obtain it without buying it. Understanding value therefore connects “What does this do for me?” with “What would I miss without it?” Both questions need a particular setting. [1]

Eva does not usually choose between all water and all diamonds. She decides whether she wants another bottle. Once she has enough to drink and finish the hike, an additional bottle may serve a less urgent purpose. Losing it means giving up the use she can most readily forgo. This leads to Marginal Utility: the importance of an additional or last available unit. The comparison assumes unchanged circumstances and interchangeable units; a new need or situation may alter the ranking. The importance of an entire category differs from that of a particular unit. [1] [2]

Eva pays at the kiosk because she prefers the bottle to the money she gives up. The seller prefers the money to a bottle from their stock. Different valuations can make voluntary exchange possible. They agree on a price, not an identical inner sense of value. Both expect an improvement when deciding, but they may be mistaken: the bottle might be damaged, or Eva may later discover a cheaper option nearby. The theory explains a reason to trade without making every completed exchange a guarantee of satisfaction afterward. [1] [3]

If Eva pays twice as much for another purchase, it does not follow that she gains twice the satisfaction. Nor does a purchase at the same price necessarily bring the same satisfaction to a wealthy tourist and someone on a tight budget. Money allows us to add expenses and compare offers, but it is not a ruler for inner experience. In Human Action, Mises distinguishes rankings of personal choices from monetary calculation. Ordinal Utility explores this further: we can prefer one option without expressing the difference in fixed units of satisfaction. What else the money could have bought matters too. [2]

Suppose someone spends a long time making a beautiful but impractical bottle Eva does not want to carry. The effort alone does not secure a buyer willing to cover its costs. That does not make costs irrelevant. Materials, wages and transport constrain what can be produced and when continuing makes sense. More expensive inputs can change supply. Expected customer demand, in turn, affects how much a producer will pay for those inputs. These are connected decisions about future uses, not a simple rule that work automatically creates a price or that costs do not matter. [1] [3]

Eva may buy a bottle believing it will keep water cold all day, then discover otherwise. Her wish was real, but her understanding of the product was mistaken. Subjective value does not remove the importance of technical properties, knowledge or truthful information. Budget and availability also limit what people can actually choose. Explaining why someone wanted an item does not mean endorsing their goal or confirming an advertising promise. It helps to distinguish a wish, an expected use and the actual outcome: each tells us something different. [1]

One person values Bitcoin for sending payments, another for holding money without giving an intermediary the ability to spend it, and another for an expected future sale. They may value the same property differently depending on needs, experience and alternatives. Limited supply alone does not tell us how many buyers will be interested tomorrow or what they will offer. Nor is price directly determined by energy spent on mining. In mining, computers compete through calculations to add the next block, a group of transactions, to the network’s shared record. Explaining a particular market requires information about demand, supply and the circumstances of exchange. Subjective value theory helps formulate those questions; it does not itself calculate Bitcoin’s future price. [2] [3] [4]