It's the most simple-- or often called a bill-- a discount bond does not pay interest; it's sold at a discount.
它是最简单的,经常被称为国库券,它是一种贴现债券,且不付息,并以折扣价发行
The price is just the present value of that stream, discounted at the interest rate.
债券的价格就是这些现金流,以利率r为贴现率算出的贴现值
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