Economics & Finance GLOBAL TRADE & TARIFFS: WTO, Free Trade, Protectionism, Quotas, Supply Chains Reading Comprehension Passages. What happens when countries tax, restrict, or open their borders to trade? Students explore how tariffs, quotas, and trade wars shape global markets and developing economies. Lessons on the WTO, free trade, and international agreements reveal how nations balance cooperation, competition, and the cost of protectionism. This digital resource features Read Aloud Audio,