Explaining the swollen middle : Why most transactions are a mix of market and hierarchy

Why are firms sometimes more efficient than markets at organizing transactions? Why are most transactions arrayed neither at the pure “market” nor at the pure “hierarchy” end of the continuum, but rather in the “swollen middle,” incorporating features of both “market” and “hierarchy”? Why don't firms make greater use of price incentives? This paper addresses these three questions by developing a model of the choice of institution.One key building block is the distinction between organizing methods (hierarchy and the price system) and institutions (firms and markets). Hierarchy and the price system are two distinct methods for organizing transactions, each with particular costs and benefits. Markets and firms are institutions which use one or both of these methods. Although markets predominantly use prices and firms rely principally on hierarchy, there is not a one-to-one correspondence between prices and markets or between hierarchy and firms. Indeed, the paper argues that it is generally more efficient to use a mix of both methods than to specialize in either.The paper focuses on the enforcement properties of prices and hierarchy. Hierarchy controls individuals directly by constraining their behavior (by imposing behavior constraints) while prices do it indirectly by measuring their outputs (through price constraints). Under hierarchy, individuals receive a salary to do as told, while self-employed individuals governed by the price system are rewarded on the basis of their output. Each system has its own biases: using prices maximizes effort (minimizes shirking) but incites individuals to inflate the price and/or reduce the quality of their output. (It encourages cheating.) Relying on hierarchy results in the opposite bias: under hierarchy individuals are not paid in function of their output, but instead are rewarded for following directives. They have, thus, strong incentives to minimize effort (to shirk) unless properly supervised, but, being paid a fixed sum to (This abstract was borrowed from another version of this item.)