In the past few weeks, the interest rate on five year treasuries has doubled to 1.9%.

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In April 2007, five-year insured muni bonds were yielding 4%, significantly less than the 4.7% offered on taxable five-year Treasuries.

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Whether or not Brazilian bonds are correctly priced at a spread of five points over Treasuries, it is clear that that spread cannot fall much further.

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Quite appropriately, this morning we learned that China has been a net seller of U.S. Treasuries for five straight months.

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The five- and 10-year Treasuries pay a mere 1.8% and 2.9%, respectively.

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Vanguard's tracks the Lehman one- to five-year Bond Index, which contains only 44% U.S. Treasuries.

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