Within rich countries, environmentalists' concerns raise intriguing philosophical questions.

ECONOMIST: Development and the environment

Today, transfers from rich countries to poor, and downwards redistribution within poor countries, are in the collective interests of the rich countries.

ECONOMIST: Letters

Within the rich world, where destitution is rare, countries where incomes are more evenly distributed have longer-lived citizens and lower rates of obesity, delinquency, depression and teenage pregnancy than richer countries where wealth is more concentrated.

ECONOMIST: Social inequality: Always with us? | The