Question

​​There is a declining trend in birth rate and death rate in countries like China & Brazil. As
a result old age population is expanding. Working age population increases due to
migration from other countries

Answer 1

Yes, the birth rate is declining in countries like China and Brazil. Hence, the proportion of young people in thee countries is declining and that of old age population is rising. These countries may face shortage of working age population in the future. The only way to increase the working age population is by encouraging migration from other countries.