Using numerical simulation, recent research on the properties of unit root tests in the presence of generalised autoregressive conditional heteroskedasticity (GARCH) is extended. The principal development concerns consideration of relative properties of linear and non-linear unit root tests in...

We develop a model that captures the basic characteristics of competitively authoritarian regimes. An incumbent (government) faces a challenge from a rival (opposition). There is also an agent (bureaucracy) who can shirk and can interfere in this contest. Shirking is costly to the incumbent. The...