Originally posted by rdrees
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I can see your point about a limited number of data points not proving his case. If you prefer, perhaps you should interpret EJ's citation of the last few CPI readings as a prediction that the trend won't reverse, rather than a critical piece of evidence; there is an awful lot more behind his analysis than those recent CPI data points.
In my view, some of the observations in this essay are not meant to stand on their own merit. They are weak arguments when viewed in isolation. Readers who have followed EJ's analysis for a long period of time, and who have read the "meatier" arguments in other threads, aren't bothered by this. I think readers who haven't read the earlier work are apt to feel that EJ is drawing too elaborate a conclusion from scant evidence. iTulip recently announced an editorial policy change in which they will not attempt to recap their core arguments in every post, and I believe your objections, and those of talaicito, are the inevitable result. iTulip is no longer repeating their best arguments in every post, but rather pointing out how data fits their thesis as it comes in.
That said, I agree with bart that at a turning point in inflation trends, it is better to track the monthly change in the index rather than the year-on-year change. The plots of various inflation measures which I have seen recently show something that looks like a "zig-zag". I agree that a few data points don't prove anything, but I think you should realize that EJ isn't attempting to "prove" anything with those data points -- he's just pointing out what he thinks he recognizes as an early marker in a process that he predicted.
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