有些投资者（如银行和保险公司）可能会因为监管或者足够现金流的原因倾向于拥有高评级（AAA）债券。
Some investors (such as banks andinsurance companies) may prefer to own the highest-rated (AAA)debt for regulatory or solvency reasons.
评级机构的这种行为对养老金和保险公司等机构投资者的影响最大，因为它们通常受到限制，只能购买高评级债券。
Such practices impact institutional buyers like pensions and insurers, which are often restricted to buying highly rated debt.
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