Capital: Tokyo GDP: $4.9 trillion Population: 127 million Quality of life: 6.2Capital: Buenos Aires GDP: $610 billion Population: 43 million Quality of life: 1.2Capital: Athens GDP: $242 billion Population: 11 million Quality of life: 1.4Capital: Singapore GDP: $298 billion Population: 5.5 million Quality of life: 4.6Capital: Vienna GDP: $428 billion Population: 8.5 million Quality of life: 7.3Capital: Luxembourg City GDP: $60.1 billion Population: 556,074 Quality of life: 6.3Capital: Berlin GDP: $3.7 trillion Population: 81 million Quality of life: 8.1Capital: Lisbon GDP: $227 billion Population: 10.4 million Quality of life: 3.5Capital: Copenhagen GDP: $336 billion Population: 5.6 million Quality of life: 9.2Capital: Paris GDP: $2.8 trillion Population: 66.2 million Quality of life: 5.5Capital: Madrid GDP: $1.4 trillion Population: 46.4 million Quality of life: 4.2Capital: Dublin GDP: $232 billion Population: 4.6 million Quality of life: 5.7Capital: Washington, DC GDP: $16.8 trillion Population: 318.9 million Quality of life: 5.4Capital: London GDP: $2.7 trillion Population: 64.5 million Quality of life: 7.3Capital: Amsterdam GDP: $854 billion Population: 16.8 million Quality of life: 8.5Capital: Stockholm GDP: $580 billion Population: 9.7 million Quality of life: 9.5Capital: Wellington GDP: $186 billion Population: 4.5 million Quality of life: 8.2Capital: Rome GDP: $2.1 trillion Population: 61.3 million Quality of life: 3.6Capital: Ottawa GDP: $1.8 trillion Population: 35.5 million Quality of life: 10Capital: Canberra GDP: $1.6 trillion Population: 23.5 million Quality of life: 9.1