不同收入水平的消费者对保险的需求是不同的。
The demands on the insurance of the consumers at different income levels are different.
然而购买力平价对确定不同收入水平的两国间的最优汇率没有作用。
But PPP is not useful for determining the optimal exchange rate between two countries of such different levels of income.
External Tax rate rules service：提供不同收入水平的当前税率。
External tax rate rules service: provides current tax rates on different income slots.
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