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1·There is no unsustainable progression driving the mechanism of a pay-as-you-go pension system and so it is not a pyramid or Ponzi scheme.

量入为出系统里面并不存在不可持续的进程，因此它不是庞氏或金字塔式骗局。

2·Some developed countries, such as United States, are running the Pay-As-You-Go (PAYG) system which the existing working force pays for the retirees.

一些发达国家，如美国，正在运行的即付即用即付(现收现付)系统，该系统主要用在有工作力支付的退休人员。

3·It is an inevitable trend to shift from pay-as-you-go to funded or multi-pillar system.

从现收现付制向部分积累制或多支柱模式转轨是大势所趋。