Bonds ground steadily better all day and closed at their best levels: the 10-year finished at 4.698%, down 3.4 basis points, and UMBS 6.0 gained nine ticks to 101.32. The 30-year fixed still printed 6.78% — a basis point higher, carrying Friday's weakness rather than Monday's gain.

The day had nothing on the calendar. No release, no auction, no event of consequence — and the tape still improved, quietly, from the open to the bell. MBS started up two ticks, doubled that by early afternoon, and held. The 10-year traded 4.713 in the morning, 4.697 by 2 PM Eastern, and settled at 4.698. Cheaper fuel prices did most of the work. That is worth naming for what it is: a move driven by commodities, not by anything the Fed or the data said. It closed the 10-year back under 4.71% for the first time since Thursday, but one close 1.2bp through a level is not a break — it is a toe over the line.

For borrowers, the practical note is that gap between bonds and the quoted rate. Bonds improved and the rate went up, because rate sheets price off yesterday's close. If today's levels hold through tomorrow morning, the improvement shows up in pricing then, not now. Wednesday is the week: PCE inflation posts the morning of August 26, alongside durable goods, with jobless claims Thursday. PCE is the Fed's preferred measure of price growth and it is the only thing on this week's calendar with the weight to move the range. Everything between now and Wednesday morning is positioning.

— David Burson, NetRate Mortgage