We use a mechanism design approach to study the organization of interest groups in an informational model of lobbying. Interest groups influence the legislature only by communicating private information on their preferences and not by means of monetary transfers. Interest groups have private...

This paper uses a mechanism design approach to characterize the optimal organization of lobbying groups in a political context where those groups have private information on their ideal points in a one-dimensional policy space. First, we derive the optimal mechanism for one single group and show...