The limit to the size of the firm is set where its costs of organizing a transaction become equal to the cost of carrying it out through the market. … - Ronald Coase

In mainstream economic theory, the firm and the market are, for the most part, assumed to exist and are not themselves the subject of investigation. One result has been that the crucial role of the law in determining the activities carried out by the firm and in the market has been largely ignored.

What is studied is a system which lives in the minds of economists but not on earth. I have called the result “blackboard economics.” The firm and the market appear by name but they lack any substance. The firm in mainstream economic theory has often been described as a “black box.” And so it is.

Outside the firm, price movements direct production, which is co-ordinated through a series of exchange transactions on the market. Within a firm, these market transactions are eliminated and in place of the complicated market structure with exchange transactions is substituted the entrepreneur-coordinator, who directs production. It is clear that these are alternative methods of coordinating production. Yet, having regard to the fact that, if production is regulated by price movements, production could be carried on without any organization at all might we ask, why is there any organization?