In this paper, we will combine the theses on intrin- sic motivation and the role of culture in knowledge shar- ing for public-good games with findings from motivational crowding-out theory. Moreover, we will study the com- bined effect of incentives and culture on knowledge shar- ing. We will argue that incentive systems for knowledge sharing are culture-dependent and support our thesis by linking knowledge sharing to (i) incentive systems and (ii) Hofstede’s cultural dimensions [27]. The hypotheses re- sulting from this new knowledge-sharing model are then tested against real knowledge-sharing behavior recorded in a multinational knowledge management system.