According to Leblang and Hill, border walls are effective ways of reducing migration.

Question

BlackTom AI · Accepted Answer

Leblang and Hill conclude that border walls are not effective at reducing migration, so the correct answer is False.

1. Relevant knowledge points and concepts
- Deterrence vs. substitution: A wall may deter some crossings but often shifts routes or methods (substitution).
- Root causes of migration: Economic differentials, networks, and political factors drive migration more than physical barriers.
- Empirical evaluation: Scholars assess walls by comparing migration flows before/after construction and against control cases, controlling for economic and policy variables.

2. Step-by-step reasoning process
- Step 1: Consider the mechanism a wall is supposed to use: physically prevent crossings to reduce flows.
- Step 2: Account for migrant adaptation: migrants use alternative routes, smugglers, or legal channels, so flows can be diverted rather than eliminated.
- Step 3: Incorporate network effects: established migrant communities sustain flows even if one route is blocked.
- Step 4: Evaluate empirical evidence: Leblang and Hill analyze cross-national data and case comparisons and find that walls have little consistent effect on net migration once other factors are controlled.

3. Calculations / intermediate steps
- No numerical calculation is required here. The logical “calculation” is substituting mechanisms and observed outcomes: physical barrier → partial deterrence + route diversification → net migration largely unchanged.

4. Why the correct answer is correct
- Leblang and Hill show walls do not address structural drivers (economics, networks), and empirical tests fail to find a substantial, durable reduction in migration attributable to walls. Thus the claim that walls are effective is false.

5. Why the other option is incorrect
- The “True” option assumes a straightforward, durable causal effect of walls on migration. This ignores displacement/substitution, migrant adaptation, and empirical findings that show negligible or temporary effects.

6. Conclusion
- Based on Leblang and Hill’s argument and evidence, the statement is False, matching the provided answer.

According to Leblang and Hill, border walls are effective ways of reducing migration.判断题

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