How does the demand curve of population decline change?

Changes in age structure, changes in labor supply and changes in consumption patterns.

1, age structure change: population decline means that the birth rate will drop and the demand curve will shift to the right. This is a decrease in the population of children and adolescents, which leads to a decrease in the demand for children and adolescents' products.

2. Changes in labor supply: The decrease of population means the decrease of immigrants or the loss of labor, and the demand curve will move to the left. This is because the reduction of labor supply will lead to an increase in wages, which in turn will affect consumers' purchasing power.

3. Changes in consumption patterns: The decrease of population will change consumption patterns and habits. If the population decline leads to the reduction of family size, the demand for large family products will decrease, while the demand for small family products will increase.