Protectionist measures are designed to shield domestic industries from foreign competition. The most common form is import duties (tariffs), which raise the landed cost of goods entering the country. This creates a barrier to trade by making imports less competitive compared to local products. Arbitration is a dispute resolution method, not a trade barrier. Carnets are documents for temporary duty-free movement of goods, and inward processing relief is an exemption for goods imported for re-export. Responsible sourcing requires buyers to anticipate the cost and risk implications of protectionism when engaging in international supply.