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Dalbar: How can the average investor lose money?
It appears that there's a confusion between the different types of average. Saying "the average investor" generally means the most common type of small-scale unsophisticated investor - the mode (or possibly median) investor. However, while this class of investors is numerous, each of them has assets that are quite small compared to some other types of investors; and the market average performance is determined proportionally to the amount of assets held, not to the number of holders; so the performance of large investors "counts" that much more. For any measure, the mode of performance can be (and often is) different from the mean performance - in this case, Dalbar is saying that the most common results are lower than the (weighed) average results.