Two-person game forms guaranteeing the stability against commitment and delaying tactics

The notions of the struggle for leadership or for followership, introduced by H. Moulin for two-person games, are considered for fame forms. Necessary and sufficient conditions for a game form never to generate a game with the struggle of either kind are derived. Connections between these properties and the existence of a Nash equilibrium for any preference profile as well as the possibility to select a Nash equilibrium in an incentive compatible way are established.