Abstract
Optimal foraging theory is a logical extension of the materialist perspective described in previous chapters, and viewed by some as an alternative to middle-range theory that is both more solidly grounded in formal theory and more directly related to the basic materialist concerns of subsistence and settlement that have traditionally dominated anthropological treatments of hunter-gatherers. We provide verbal descriptions, theoretical justifications, and graphical and mathematical representations of a variety of classic and more recently developed models derived from microeconomics and ethology.
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- 1.
To follow the parallel a step further, in this light the middle-range critics of optimal foraging theory seem to be taking much the same stand as J. S. Mill took against utilitarianism. In reference to the analogy between utilitarian theory and models of frictionless engines in physics, Mill noted that, although for some purposes such simplifying assumptions might be useful, they alone could never result in a comprehensive accounting of actual cases. That was so because such disturbing causes as friction often caused expectations arising from simple principles to be wrong when put to empirical test and more important because those disturbing causes were not merely random noise but rather forces important in their own right, subject to their own laws, and, therefore, a legitimate and necessary subject of study (cf. Burrow 1966:74). The analogy between J. S. Mill’s “disturbing” forces and middle-range “processes of site formation” can hardly be overlooked here.
- 2.
Metcalfe and Jones (1988:495) argue that the diet breadth model differs from Binford’s modified general utility curve in that the contingency model predicts that the use (or disuse) of an item will be complete rather than partial (an item is either in the optimal set or it is not). By this logic, one would expect all skeletal elements representing body parts above a given utility threshold to be equally represented (or unrepresented) in archaeological assemblages; that is, they would not be differentially represented according to their individual utility as Binford’s utility curves imply. In practice, however, the utility indexes obtained for individual skeletal elements are probably best regarded as means representing the central points of a presumably large range of variation. This and other sources of error, including those made in butchering and judging utility, make the probabilistic utility curve at least as realistic as the non-probabilistic contingency alternative.
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Bettinger, R., Garvey, R., Tushingham, S. (2015). Hunter-Gatherers as Optimal Foragers. In: Hunter-Gatherers. Interdisciplinary Contributions to Archaeology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-7581-2_4
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