With reference to the class of asset pricing models with a market maker and mean-variance optimization of speculative agents, the note seeks to clarify the concepts behind the price adjustment rule, which are often treated somewhat carelessly in this literature. Calling attention to the...

Introduction: capitalism and the boundaries of finance -- The boundaries of finance in the sociological tradition -- Prestige, at last: the social closure of the stock exchange -- Financial knowledge and the science of the market -- Close up: price data, machines, and organizational boundaries...