Assess students' ability to analyze how tariffs and trade barriers affect domestic industries (output, employment, competitiveness), consumer welfare (price changes, consumer surplus), government revenue (tariff receipts versus efficiency losses), and international supply chains (input costs, sourcing decisions, delays, and retaliation). Tasks may include supply-and-demand diagrams, welfare and deadweight-loss calculations, incidence analysis, short- vs long-run effects, comparing tariffs with quotas, and evaluating policy trade-offs using real-world examples.