In this paper we model the commercial lobbying industry (such as the so-called K-Street lobbyists of Washington, D.C.). In contrast to classical special interest groups commercial lobbying firms are not directly motivated by policy outcomes. They exist to make profits by selling intermediaries...

This study explains the observed repeated personal interactions between lobbyists and policymakers. The analysis uses a dynamic model of commercial lobbying in which citizens may hire lobbyists to present policy proposals on their behalf to policymakers. It is shown that repeated interactions...