I model the dynamic between ruler and successor. The ruler cultivates a successor for a smooth power transition but fears being ousted by him, while the successor fears being removed by the ruler. The successor accumulates power while not threatening the ruler, and he prolongs their relationship by maintaining a low profile. The ruler gradually becomes more intolerant of the successor's growing power but, as his life nears its end, has less incentive to replace the successor. Thus conflict is most probable in the middle of their relationship; moreover, a predetermined succession order could increase its likelihood by restricting the ruler's choice. In the multi-candidate case, the strong candidate has some advantage but conflict is more likely to occur.

Now that most countries have harmonized intellectual property right (IPR) legislation as a consequence of signing the Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPs), the dispute about the optimal level of IPR protection has shifted toward IPR enforcement. This paper develops an endogenous growth framework with two open economies satisfying the classical North–South assumptions to study (a) the regions' incentives to enforce IPRs in a decentralized game, (b) the desired IPR enforcement of the two regions in negotiation rounds on global harmonization, and (c) the constrained efficient enforcement level. We show how the different solutions relate to each other and how the results depend on the research productivity in the North and the regions' relative market sizes. Although growth rates increase substantially when IPR enforcement is harmonized at the North's desired level, our numerical simulation suggests that the South may also benefit in terms of long-run welfare.