President Biden has openly celebrated recent inflation reports, and Federal Reserve officials have also breathed a sigh of relief as rapid price gains show signs of losing steam.But the pressing question now is whether that pace of progress toward slower price increases — one that was long-awaited and very welcome — can persist.The Fed’s preferred inflation measure, the Personal Consumption Expenditures index, is expected to tick up to 4.2 or 4.3 percent in a report on Thursday, after volatile food and fuel costs are stripped out. That would be an increase from 4.1 percent for the core measure in June. And while it would still be down considerably from a peak of 5.4 percent last summer, such a reading would underscore that inflation remains st …
