1 Subjects: “...-19,Repo specialness,Public debt sustainability,Cryptocurrency,Populism,Tail risk,Market risks...”

2 Subjects: “...human population density...”

3 Subjects: “...population density...”

4 Subjects: “...population sizes...”

5 Subjects: “...population exposure to air pollutant...”

6 Subjects: “...population density...”

7 Subjects: “...finite population...”

8 Subjects: “...population-based intelligent optimization algorithm...”