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Price is not the same thing as value. Things are ‘valuable’ because people think they are, and for no other reason. The ‘value’ which an individual places on a commodity can’t be measured; its value will be different for different people. The economist is interested only in ‘value in exchange’. The economic worth of value of a good can only be measured in some kind of market transaction which reveals the value of the good in terms of what is offered in exchange for it. Nowadays practically all exchanges represent an exchange of goods and services for money, and prices in terms of money are the market value of the things.