The different applications of the lognormal model in describing the distribution of various populations from both the biophysical and socioeconomic spheres are reviewed. A discussion then follows of the underlying causal relationships which seem to govern the behavior of these populations. They seem to be, firstly, the existence of a large number of members in the population; and secondly, competition among the members for a common resource. Finally, the usefulness of the model as a general model describing such populations is discussed.
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