边缘城市是新经济增长阶段的产物。
不同的经济增长阶段，经济与环境的关系具有不同的特征。
Relations between economy and environment have different characters in different growing phases.
他说，一旦一个经济体达到了人均收入15000美元（以购买力平价计算）的阶段，经济增长对幸福的促进作用就停止了。
Once an economy reaches an income per person of about $15,000 (measured at purchasing-power parity), economic growth ceases to add to happiness, he says.
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