The sudden spike in interest for junk-rated bonds reflects the ongoing reflation trade that has spanned across assets as the economic outlook improves. The improved outlook has weighed on bond markets and set yields soaring higher, but it has also improved demand for relatively lower duration junk bond ETFs. “What we’ve had in bond markets for much of the year to date is a selloff in duration, which has meant that high yield, which is high spread and low duration, has been the safer asset class,” Peter Chatwell, head of multi-asset strategy at Mizuho International Plc, told Bloomberg. “These flows reflect that, and we expect there will be further moves in that direction as U.S. growth becomes more broad based and helps to support the rest of the world.”