Unilateral preferences aim at increasing exports from developing countries via reductions on applied tariffs and the incentives created by the preference margin. After decades of existence of these schemes, an important policy question is whether preferential schemes have been effective in...

Preferential Trade Agreements (PTAs) aim at increasing trade flows via reductions on applied tariffs and the incentives created by the difference between the applied and the most favoured nation (MFN) tariff, the preference margin. An often omitted element in PTAs evaluation is the possibility...