An institution is defined as collective action in control, liberation and expansion of individual action. Its forms are unorganized custom and organi… - John R. Commons

The smallest unit of the institutional economists is a unit of activity — a transaction, with its participants. Transactions intervene between the labor of the classic economists and the pleasures of the hedonic economists, simply because it is society that controls access to the forces of nature, and transactions are, not the "exchange of commodities," but the alienation and acquisition, between individuals, of the rights of property and liberty created by society, which must therefore be negotiated between the parties concerned before labor can produce, or consumers can consume, or commodities be physically exchanged.

Other races of immigrants, by contact with our institutions, have been civilized—the negro has only been domesticated.

But institutional economics is the field of the public interest in private ownership, which shows itself behavioristically in buying and selling, borrowing and lending, hiring and firing, leasing and renting. The private interests become the field of intangible yet quantitative and measurable rights, duties, liberties and exposures to the liberties of others. These are various aspects of rights of ownership. What we buy and sell is not material things and services but ownership of materials and services. The correlation of engineering economics, home economics, and institutional economics makes up the whole of the science of political economics.