The dynamics of lobbying — A differential game

This paper presents a dynamic model on lobbying. The interactions between two competing lobbies, who attempt to influence regulations and legislation, are modelled as a differential game. We consider for this game first a time consistent and then a subgame perfect equilibrium (in linear Markov strategies). The subgame perfect equilibrium lowers considerably lobbying activity and expenses. This provides a partial explanation of the puzzle that rent-seeking expenses are often small compared with the prize sought.