Building on Posner (Posner, Daniel N. 2005. Institutions and Ethnic Politics in Africa. New York: Cambridge University Press), this article describes a framework for organizing the information about a community’s social cleavage structure so as to identify the incentives that individuals face to adopt particular social identities. The framework is parsimonious but powerful: it generates predict...

judge Richard Posner's well-known view is that constitutional theory is useless. And judge J Harvie Wilkinson III has lambasted constitutional theory for the way in which its "cosmic" aspirations threaten democratic self-governance. Many other judges hold similar views. And yet both Posner and Wilkinson-in the papular press, in law review articles, and in books-have advocated what appear to be ...

An attempt has been made to confirm the potentially important observation made by Posner that subcutaneous growth of Walker carcinoma 9256in rats results in defec tive fat absorption, as measured by the amount of I'31-labeled tniolein in thonacic duct lymph. Posnen's results could not be confirmed. It is concluded that, under the condi tions of the present experiments, growth of the Walker tumo...

The difference between Apolipoprotein E ε4 carriers and non-carriers in response to single exercise sessions was tested. Stroop and Posner tasks were administered to young untrained women immediately after walking sessions or moderately heavy exercise. Exercise had a significantly more profound impact on the Stroop effect than on the Posner effect, suggesting selective involvement of prefrontal...