You'll lose money first because that 30-year Treasury bond, with its 4.5% coupon rate of interest, will look pretty pathetic in a year if 30-year bonds are paying 6%.

你亏钱首先是因为持有了30年期的国债，它的票面利率是4.5%，如果一年之内30年国债的利率升到6%，那你手头的债券就亏大发了。

youdao

But reasonably sophisticated investors can create the same product themselves by purchasing a risk-free zero-coupon Treasury bond and call options on a stock index, such as XSP options traded on the Chicago Board Options Exchange.

FORBES: Guaranteed to Go Up

The dividend is riskier than the coupon on a long Treasury bond (which yields about the same) but is presumably better protected against inflation.

FORBES: Where's The Juice?