1. Abandoned homes. In a smaller towns of less than 100,000 populations, there will be many homes that are abandoned like the Akiya homes in Japans. Many rundown houses will be sold at a cheap price. 

2. City migration. Many locals will shift to the big cities for better opportunities and communities. 

3. Property value in big cities will increase due to higher demand. 

4. With fewer children being born, the proportion of older people in the population is increasing. This can put a strain on healthcare systems, pension schemes, and social welfare programs.

5. Shrinking workforce. As the population ages and fewer children are born, the workforce may shrink. This can lead to labor shortages and a decline in economic productivity.

6. Fewer taxpayers. As the population ages and the workforce shrinks, there may be fewer taxpayers to support government programs and services. Meaning, higher tax for the smaller number of population eventually. 

7. Urban decay. With fewer young families moving into cities, neighborhoods may become more rundown and neglected. This can lead to a decline in property values and quality of life.

8. Reduced social connections: With fewer children being born and fewer young families living in cities, there may be fewer opportunities for social connections and community building.

9. Declining consumer spending: With fewer young families, there may be less consumer spending in cities. This can lead to a decline in local businesses and a negative impact on the economy. An increment of cost for general products. 

10. Increased healthcare costs: As the population ages, healthcare costs can increase significantly. The cost of caring for elderly citizens can place a burden on government resources and healthcare systems.

11. Higher dependency ratio: With fewer children being born, there may be a higher dependency ratio, which is the number of people who are not in the workforce (i.e., children and the elderly) compared to the number of people who are. This can put a strain on the economy and government resources. This is true for families who are forced to support theit own kins. 

12. Decline in innovation: With a shrinking workforce, there may be fewer resources available for research and development, which can lead to a decline in innovation.

13. Decreased cultural vitality: With fewer young people and families, there may be a decline in cultural vitality, as there are fewer opportunities for cultural exchange and creativity.

14. Increased social isolation: With fewer children and young families, the elderly population may become increasingly isolated and lonely, which can have negative effects on mental and physical health.

15. Higher poverty rates: With a declining birth rate, there may be fewer opportunities for employment and economic growth, which can lead to higher poverty rates.

16. Reduced diversity: With a decline in population, there may be less diversity in the population, which can have negative effects on social cohesion and inclusivity.

17. Struggle to maintain public services: With a shrinking tax base, local governments may struggle to maintain public services, including transportation, utilities, and infrastructure. There is a good chance that these public services will be neglected with poor quality services. 

18. Increased debt burden: With a declining birth rate, the government may need to borrow more money to fund programs and services for an aging population, which can lead to an increased debt burden.

19. Decreased political power: With a shrinking population, cities may have less political power and representation in government, which can have negative effects on decision-making and resource allocation. 

All of the above lead to one thing. A much heavier crash in stock market eventually.