The smallest unit of the institutional economists is a unit of activity — a transaction, with its participants. Transactions intervene between the la… - John R. Commons

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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.