Are US Treasury Bills still Zero Beta?

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Are US Treasury Bills still Zero Beta?
The books say that beta can be zero for absolutely risk-free stocks. US Treasury Bills are generally perceived to be such assets as well as other governments' bonds. Considering the present economic turmoil, I have doubts that this theory will hold. I don't know about negative beta :)

US Treasury Bills
Indeed Anna, US treasury bills or government bonds were always considered to be risk-free. The reason behind this was originally that our US economy was so strong and the country so big and solid. In the last decade or so this changed and the reason became that we all agreed that we would consider the risk to be zero (even if we had some doubts already). In the last couple of years we still kept to this agreement even if we knew things had changed, because nobody was willing to accept the consequence (a system crisis). Now that we have the crisis it is obvious that the old paradigm no longer holds: US Treasury bills can no longer be considered risk-free.



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