Share your insights or perspective on the financial matter presented in the input.

What's behind the long secular bull market in U.S. Treasuries?
I believe that it's largely irrational, fueled largely by foreign investors that are afraid to invest anywhere else. There are a few people out there right now who are writing about this: http://www.marketwatch.com/story/us-treasuries-largest-bubble-in-world-history-says-nia-2011-08-30 http://articles.businessinsider.com/2010-08-25/markets/30080511_1_fed-first-yields-mbs As to why would you invest in long-dated versus short? Probably to chase yield. The 30 year yields 30x more than the 1 year. It's also easier to buy on the long end if you believe that the economy will remain slow for another decade or two and therefore the central banks will keep rates low for a very long time. Of course, at the moment, long-dated treasury prices are artificially high because of operation twist.