This is from this Bloomberg article The Black Hole Engulfing the World’s Bond Markets
A bond can have a modestly positive coupon when issued by a government, institution or company, but once it starts trading, high demand by investors can push its price up — and therefore its yield down — to such an extent that buyers no longer receive any payment. Some funds track government bond indexes, meaning they must buy the bonds regardless of the yield.
The whole article is informative and a quick read.
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