Title: The Bond Market Bubble: Fact or Fiction?
Headings: 
The Bond Market Bubble: Fact or Fiction?
What Is a Bond Bubble?
Bubbles Throughout History
Understanding When It's Really a Bubble
Contributing Factors to a Bond Market Bubble
If the Bubble Is Real, Will It Burst?
Longer-Term Data Shows the Rarity of Major Sell-Offs
Non-Treasury Segments of the Market
Positive and Negative Returns
Weathering a Bond Market Bubble

Content: In other words, a higher yield would drive renewed demand for bonds, moderating the impact of any sell-off. Could the U.S. bond market eventually collapse as many are predicting? Possibly, but not likely if the post-crisis experience in Japan, which has been very similar to ours thus far, is any indication that rates can remain low—for far longer than investors are expecting. Longer-Term Data Shows the Rarity of Major Sell-Offs
A look further back shows that the downside in Treasuries has been relatively limited. According to data compiled by Aswath Damodaran at New York University’s Stern School of Business, the 30-year bond has suffered a negative return in only 15 calendar years since 1928. In general, the losses were relatively limited. Keep in mind, however, that yields were higher in the past than they have been recently, so it took much more of a price decline to offset the yield in the past than it would today. While past performance isn’t an indicator of future results, it does help illustrate the rarity of a major collapse in the bond market. If the bond market does indeed fall upon hard times, a more likely outcome is that we’ll see consecutive years of sub-par performance, such as what occurred in the 1950s. Non-Treasury Segments of the Market
Treasuries aren’t the only market segment said to be in a bubble.