Comparative Advantage in Vaccine Production

Steps:

• Identify the scenario: High-income countries develop vaccines (innovation stage), low-income countries manufacture for export (production stage).
• Recall international division of labor: Countries specialize based on comparative advantages like skills and costs.
• Match to choices: Option A aligns with high-income expertise in R&D and low-income cost efficiencies.
• Eliminate irrelevant options: C and D don't explain specialization; B mismatches labor types.

Why A is correct:

• Reflects comparative advantage theory, where high-income countries leverage specialist availability for R&D, while low-income countries use low-cost production for manufacturing efficiency.

Why the others are wrong:

• B: Low-income countries built high-tech factories, requiring skilled labor, not unskilled over-supply.
• C: Disease avoidance doesn't explain production specialization or export focus.
• D: Governments controlled vaccine allocation globally, contradicting the division of labor.

Final answer: A