Introduction.- EU Preferential Trading Arrangements: Evolution, Content and Use.- EU Preferential Margins: Measurement and Aggregation Issues.- The Gravity Model in International Trade.- Trade Impact of EU Preferential Policies: a Meta-analysis of the Literature.- Trade Impact of EU Preferences.- Analysing the Impact of Everything but Arms Initative Using a Gravity Model.- Trade Impact of EU Preferences: an Analysis with Monthly Data.- Trade Preference Through Tariff Rate Quotas and the Gravity Equation: Does the Tariff Equivalent Matter?- Trade Impact of EU Preferences: the Role of Compliance Costs.