This paper generalizes Rubinstein and Wolinsky’s model of middlemen (intermediation) by incorporating production and search costs, plus more general matching and bargaining. This allows us to study many new issues, including entry, efficiency and dynamics. In the benchmark model, equilibrium...

Explanations of why changes in the relative quantities of safe debt seem to affect asset prices often appeal informally to a “portfolio balance” mechanism. I show how this type of effect can be incorporated in a general class of structural, arbitrage-free asset-pricing models using a...