While there may be legitimate concerns about a bond market bubble, it doesn't appear that the bubble will pop anytime soon, BlackRock's Rick Rieder suggested Thursday.
That's because bubbles usually blow up when there is more supply than demand, he said.
"I think there is a legitimate point about where … developed markets rates are relative to what is fundamental value," the chief investment officer of global fixed income at BlackRock said in an interview with CNBC's "Power Lunch."
"The thing that is extraordinary about today's market is that demand still outstrips supply. So while some of these valuations are high ... that can go on a long time."