Supply-side policies boost production and efficiency

Steps:

• Define supply-side policy: government actions to increase aggregate supply by improving productivity, skills, or incentives.
• Evaluate each option: check if it directly enhances supply capacity rather than demand or restriction.
• Identify promotion of supply: look for incentives like subsidies that encourage output or investment.
• Select the match: choose the option that fits the definition without contradicting it.

Why D is correct:

• Subsidies to businesses for training directly increase labor skills and productivity, shifting aggregate supply rightward per economic theory.

Why the others are wrong:

• A: Import quotas restrict supply, reducing availability and acting as protectionism, not boosting production.
• B: Higher interest rates mainly curb demand by discouraging borrowing, with indirect savings effects not targeting supply-side efficiency.
• C: Specific taxes on supply raise costs for producers, shifting supply leftward and hindering output.

Final answer: D