Even Dimensional Fund Advisors Struggles with Inflation Statistics
Inflation is a risk we have to face in financial planning, particularly in retirement. We need to measure inflation risk correctly to be able to make reasonable financial plans. The best guide we have to the future takes into account past inflation statistics. But the field of statistics is full of subtleties, and even Dimensional Fund Advisors (DFA) can make mistakes. DFA creates good funds, and their advisors tend to do good work for their clients. I’d prefer to find errors in the work of a less investor-friendly investment firm, but they provided a clear example to learn from. They misapplied a statistical rule, and as a result, they misinterpreted the history of inflation over the past century. I discussed this issue with Larry Swedroe in posts on X. I respect Larry and have followed his work as he tirelessly explains evidence based investing to the masses. A Simple Example To explain the problem, let’s first begin with a simpler example. So...
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