"The tardy introduction of transaction costs into economic theory is related to the fact that, until recently, most economic theories and models assumed full information, and transaction costs are in one way or another associated with the cost of acquiring information about exchange. But the concepts of information costs and transaction costs are not identical. A lonely person on a desert island will encounter information costs as he goes about his "home production," but an isolated individual does not engage in exchange and therefore will have no transaction costs."

“Adam Smith began his Wealth of Nations with an examination of the internal works of a pin factory, but he soon turned his attention to other things: the coordination of a market system and the economics of growth and development. For more than a century and a half following the publication of Smith's masterpiece, the nature and internal organization of the firm received little attention in mainstream economic theory.”

“We begin by introducing what we refer to as the naive theory of property rights and its application in several areas. The naive theory looks at the emergence or nonemergence of exclusive rights in terms of the costs and benefits of exclusion and the cost of internal governance when individuals share property rights.”

“In general terms, transactions costs are the costs that arise when individuals exchange ownership rights to economic assets and enforce their exclusive rights. A clear definition of transactions costs does not exist, but neither are the costs of production in the neoclassical model well defined.”

“Demsetz refers to the hypothetical economic system of neoclassical economics as the decentralized model. According to the usual implicit and explicit assumptions of the decentralized model, the cost of information is zero; private property rights are fully defined and enforced at zero cost; and the state stays in the background, upholding the institutions of market exchange. Economic outcomes derived from this model are found in the standard textbook: For any underlying distribution of resources, wealth is maximized; output is valued by consumers who take indirectly into account the value of leisure and other extra-market activities; income distribution depends on wages and the prices of nonhuman inputs which equal the value of marginal products; and economic resources always find their highest-valued uses.”

“This book grew out of my interest in organizational forms and institutional arrangements and their impact on economic outcomes. Price theory or microeconomics, in its conventional form, treats organizations and institutions the same way as it treats the law of gravity: These factors are implicitly assumed to exist but appear neither as independent nor as dependent variables in the models. Such economy in model making can be eminently reasonable. It enables us to isolate critical relationships and simplifies the use of mathematical tools in the analysis. However, unlike the law of gravity, organizations and institutions are not invariant; they vary with time and location, with political arrangements and structures of property rights, with technologies employed, and with physical qualities of resources, commodities, and services that are exchanged. In fact, production involves not only the physical transformation of inputs into outputs but also the transfer of property rights between the owners of resources, commodities, and labor services. In the transfer of rights, whether within firms or across markets, agents maximize their objective functions subject to the constraints of organizations and institutions.”

“Without the state, its institutions, and supportive framework of property rights, high transaction costs will paralyze complex production systems, and specific investments involving long-term exchange relationships will not be forthcoming.”