the existing literature focusing on various classical determinants of tax revenue. With regards to terrorism, both indicators—the number of attacks or fatalities scaled by population—are found to be statistically significant at the 5 percent level with a negative effect on the tax-to-GDP ratio. The point coefficient estimate for the number of terrorism-related fatalities per million inhabitants, however, is -0.0004, which is about four times greater than the point coefficient estimate for the number of terrorist attacks. Furthermore, although the marginal economic
of dealer-client relationships according to client sophistication. When we include Sophistication in Column (2), the premium for relationship trades is no longer statistically significant. To explore the client type dependence of the relationship premium, Column (3) interacts the Relationship dummy with Sophistication . The point coefficient estimate of -1.097 is statistically significant at the 1% level, as is the coefficient for Relationship at 3.594. Accordingly, the median client pays a relationship premium of approximately 7.8 pips relative to the