Please answer with True, False or Uncertain answers. (Explanation required)

1. The functional distribution of income refers to the distribution of income between rural and urban individuals.

2. The poverty gap is the percentage of the population below the international poverty line.

3. Assuming their Lorenz curves do not cross, if Country A's Gini coefficient is 0.72 and Country B's Gini coefficient is 0.38, we can conclude that income is distributed more equally in Country A as compared to Country B.

4. According to the Kuznets hypothesis, income inequality first falls then rises as per capita income rises.

5. The proportion of the total population aged 0-15 and over 65 is known as the unproductive population.

6. According to the microeconomic household theory of fertility, children in poor societies are seen, at least in part, as economic investment goods because children act as parents' social security or old-age pension.

7. Some social scientists argue that rapid population growth is not a problem because it reduces family saving rates.

8. The notion that cities are generally formed because they provide cost advantages to both consumers and producers is known as agglomeration externalities.

9. The urban informal sector is characterized by substantially higher labor productivity levels than the formal sector.

10. Rural-urban migration is primarily a developing-country phenomenon.