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This paper analyses in a sample equilibrium framework how uncertainty regarding the future level of taxes on factor incomes in the Mexican economy affects the overall volume of domestic investment and capital flight. It is a variation of the Alesina-Tabellini model, and brings out the importance of income effects in determining how the volume of capital flight responds to changes in key policy uncertainty parameters. (DSE/DÜI)

In this paper we estimate gravity models to see whether trade volumes of countries in the MENA region are significantly lower than what would be expected given their economic, cultural and geographical characteristics. Our empirical results show that the variables used in standard gravity models cannot explain a significant part of MENA's trade performance, particularly on exports. We then go on to 'augment' the standard gravity model with relevant variables from the World Bank's Business Enterprise surveys. Our results further show that these variables, and in particular transport constraints