Intrinsically, through its own components, the selectorate theory explains the longevity of autocratic leaders through reference to their institutional environment. Two dimensions determine this environment (BdM et al.1999): the selectorate (those who have a say in selecting the leader) and the winning coalition (whose support is necessary for the leader to stay in power) these two form the loyalty norm (the probability of being apart of the next winning coalition). The sizing of the first two dimensions plays an essential role in explaining the longevity of autocratic leaders. For instance, the durability of a leader is enhanced with a large selectorate because the larger the selectorate the greater the advantage the incumbent has over opposition. This is because there is a lower chance of the defector successfully joining the next winning coalition, so they have a strong loyalty norm. Similarly, a small winning coalition is equally advantageous for a leader’s tenure as then it takes a fewer amount of private goods to “buy off” the necessary support needed to remain in power (BdM et al. 1999), making the process of maintaining power easier. So, considered intrinsically, the selectorate theory is able to explain the longevity of autocratic leaders through the size of the winning coalition (small) and selectorate (large).
References: Bueno de Mesquita, B., Morrow, J., Siverson, R. and Smith, A. (1999). Policy failure and Political Survival. The Journal of Conflict Resolution, 43(2), pp.147- 161. Gandhi, J. and Lust-Okar, E. (2009). Elections under Authoritarianism. Annual review of political science, [online] 12, pp.403-416. Available at: http://www.annualreviews.org.gate2.library.lse.ac.uk/doi/pdf/10.1146/annurev.polisci.11.060106.095434[Accessed 15 Jan. 2015]. Gandhi, J. and Przeworski, A. (2007). Authoritarian Institutions and the Survival of Autocrats. Comparative Political Studies, [online] 40(11), pp.1279-1301. Available at: http://cps.sagepub.com.gate2.library.lse.ac.uk/content/40/11/1279.full.pdf+html [Accessed 16 Jan. 2015]. Kokkonen, A. and Sundell, A. (2014). Delivering Stability—Primogeniture and Autocratic Survival in European Monarchies 1000–1800. American Political Science Review, [online] 108(02), pp.438-453. Available at: http://journals.cambridge.org.gate2.library.lse.ac.uk/action/displayAbstract?fromPage=online&aid=9283405&fileId=S000305541400015X [Accessed 16 Jan. 2015]. Magaloni, B. (2008). Credible Power-sharing and the Longevity of Authoritarian Rule. Comparative Political Studies, [online] 41(4/5), pp.715-741. Available at: http://cps.sagepub.com.gate2.library.lse.ac.uk/content/41/4-5/715.full.pdf+html[Accessed 16 Jan. 2015].