Power sharing with weak institutions ∗

Democratic transitions, franchise extensions, and civil war settlements can often be seen as power-sharing agreements in which opposing factions try to use institutional structures to ‘lock in’ the terms of a settlement. But the commitment power inherent in institutions varies. When the institutional environment is weak and credibility is low, it is difficult for a powerful elite to tie its hands and give up power. This article studies a window-of-opportunity model in which an enfranchised elite faces a periodic threat. Institutional weakness is parameterized in terms of the elite’s marginal return to trying to undermine a power-sharing agreement. The analysis shows that (i) bargaining breaks down if the overall institutional environment is too weak and why it does; (ii) equilibrium agreements share more power with the opposition when the institutional environment is weak; (iii) there is a non-monotonic relation between power sharing and how often the opposition poses a threat; and (iv) power sharing is path dependent.