After a frustrating selling spree last Friday, bonds are starting the new week with a bit more selling.  Much like Friday, justifications are not as satisfying and obvious as many market watchers may hope.  That said, things are a bit more reasonable given the fact that today's weakness isn't as pronounced during domestic hours.  The overnight session was more of a gradual affair judging by the linear downtrend in Treasury futures prices. 

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As for bad actors, we've seen quite a lot of blame placed on oil prices, but continue to take that with a grain of salt.  There are two many instances like the one highlighted in the chart below to give oil credit for very much short term momentum in bonds.

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Better candidates might include today's sharply elevated corporate bond issuance or a few various Fed speakers creating short-end volatility.