Alan Greenspan: We are in a bond market bubble 24 Mins Ago | 01:11 Former Federal Reserve Chariman Alan Greenspan told CNBC on Thursday the decadeslong bull market in bond prices is coming to an end. “We are in a bond market bubble” that’s beginning to unwind, he said on “Squawk on the Street,” as new Fed Chairman Jerome Powell appeared on Capitol Hill for the second time this week. “Prices are too high” on bonds, Greenspan added. Bond prices move inversely to bond yields, which spiked higher in the new year, recently hitting four-year highs of just under 3 percent. Greenspan is in good company in predicting a bond price bubble.