Reducing labor costs by selecting labor from specific nationalities is usually related to the following factors: 1. **Wage level differences**: The labor market in some countries may have lower average wage levels. Companies take advantage of these differences and hire workers from these countries to reduce overall wage expenses. 2. **Social security and welfare requirements**: Different countries have different requirements for social security, medical insurance, paid vacation and other welfare benefits. Choosing labor from countries with lower welfare requirements can reduce companies' expenses in these areas. 3. **Exchange rate fluctuations**: If wages are paid in local currency and the currency of that country is relatively weak compared to the currency of the company's country, this may also indirectly reduce labor costs. 4. **Legal and regulatory costs**: Some countries have fewer legal requirements for labor protection, making related costs (such as overtime pay, severance pay, etc.) lower. Choosing labor from these countries can reduce compliance costs. 5. **Visa and immigration fees**: Sometimes, hiring foreign workers may involve specific visa or work permit fees, but if these fees are lower than differentiated labor costs, companies may consider it worthwhile. It is important to note that such practices may bring legal and ethical challenges, including compliance with international and local labor laws and requirements for maintaining corporate social responsibility.