Why do states engaged in enduring rivalries sometimes live at peace, while at other times get involved in conflicts? Why are there periods of détente and active conflicts in extremely conflictual dyads? To address these questions, a focus on an enduring rivalry situated in the developing world...

In this paper we study the zero frequency spectral properties of fractionally cointegrated long memory processes and introduce a new frequency domain principal components estimator of the cointegration space and the factor loading matrix for the long memory factors. We find that for fractionally...