Measures of bilateral political relations are typically long-memory (fractionally integrated) processes. Appropriate inference and interpretation of this property hinges on the underlying reasons behind it. There are three possible explanations: (i) mechanical aggregation, (ii) bilateral...

An extensive number of studies investigate the effects of political relations on trade by estimating a gravity model using annual (or quarterly) data. We argue that the use of low-frequency data introduces an aggregation bias because the cycle of moderate political shocks is much shorter...