But gold generates no income. It is, in a sense, a perpetual zero coupon bond. So valuing it isn't easy.

但黄金不能带来收入。从某意义来说，黄金是一种永续的零息债券。因此对其进行估值并不容易。

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Preferred Stocks: Preferred stock is like a perpetual bond.

优先股：优先股就像一个永久的纽带。

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The coupon on Reliance's perpetual bond was set at 5.875% the lowest in the world this year for a U.S.-dollar senior true perpetual bond.

WSJ: Perpetual Bond Risk Rises With US Treasury Yields

The bond issued by Reliance, an energy and materials company one of India's largest companies, was the third and biggest perpetual bond issued in Asia this year, according to data provider Dealogic.

WSJ: Perpetual Bond Risk Rises With US Treasury Yields

Typically, buyers of perpetual bonds receive a fixed rate of return but expect the issuer to redeem the bond after several years.

WSJ: Perpetual Bond Risk Rises With US Treasury Yields