What’s going on? I think it’s this: Most portfolio management payments are a percent of value — you pay a fee, say 1%, of the total value of the portfolio. When the stock market goes down 10%, you pay 10% less in fees. Now, the BEA’s job is to figure out, did you get 10% less quantity — did you get 10% less “valuable advice” for that fee? You’re not an idiot, so you’re paying 1% off the top of your wealth annually, a third of Senator Warren’s dreaded wealth tax, for something of value, the BEA figures. Or did the “price” of financial services go down 10%? Evidently, the BEA assumes the price, not the quantity changed, so the “price” of financial services tracks the stock market.
This is of course nonsense. On the other hand, I have no better idea how to separate 1% management fees into a “price” or a “quantity” (or, heaven forbid, a “quality improvement”). The number of people working to provide you financial advice didn’t change 10%. Though, in the long run, it will if the market stays down. How should, or does, the PCE handle rents, or dividend payments? I don’t know.
I went back to the documentation for how the PCE is constructed to try to understand these questions and see if my hunch is correct, but I failed to understand anything in there. (I got lost in the “commodity flow method,” see p. 5-27.) I would value comments from people who understand this stuff.
Overall, I think the lesson is that our measures of inflation are pretty noisy. First we throw out food and energy. Now it looks to me that “core” should throw out management-fee based financial services, or at least assume that the price is fixed (1% sounds like a fixed price) rather than the quantity. Do real estate and other commissions do the same thing and the price index rises and falls with the price of housing? What’s next?
(The point of throwing out food and fuel is not that they don’t matter but a feeling that the core CPI today is a better guide of where the overall CPI will be in the future. A more thorough analysis of which components are better forecasters of overall CPI would be welcome.)
Maybe an inflation measure that is less comprehensive but better measured isn’t such a terrible idea. Maybe the Fed worrying about 1.8% vs. 2% inflation is not such a good idea.