通过提供一组证券来保有本金，获得有上限收益的保本票据也不断变得流行起来。
Principal-protected notes, which offer a basket of securities that secure capital and put an upper-limit on returns, are also increasingly popular.
银行资本还受到来风险加权的冲击，因为评级为垃圾的债务需要采取惩罚性加权，这意味着银行必须为它们准备更多的资本金，高达顶级评级证券所对应的五倍。
They hit capital in another way, too, because junk-rated debt carries a punitive risk weighting; Banks must set aside five times as much capital as they have to for top-notch securities.
当不同期的按揭证券并非由同一出资者拥有时，承销本金还存在着法律方面的问题。
There are also legal issues with underwriting principal when different tranches of mortgage-backed securities are not held by a single investor.
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