I present a two-player nested contest which is a convex combination of two widely studied contests: the Tullock … (lottery) contest and the all-pay auction. A Nash equilibrium exists for all parameters of the nested contest. If and only if … the contest is sufficiently asymmetric, then there is an equilibrium in pure strategies. In this equilibrium, individual …

cohesion effect ': if the contest between the groups becomes more decisive, or contractual incompleteness between groups … becomes more serious, the players devote fewer resources to the intra-group conflict. Moreover, there is also a 'reversed … becomes less serious, the players devote more resources to the inter-group contest. The model also sheds new light on …

groups hinders their chances of prevailing in the contest. If possible; members may find beneficial to engage in progressive …

I analyse a group contest in which groups decide over two dimensions of membership-exclusivity: whether a member is … group all lead to the emergence of equilibria with endogenous non-exclusive membership. A contest designer interested in …