An opportunity cost model of subjective effort and task performance. Kurzban, R. commonsenseatheism.com.
bibtex   
@Article{Kurzban,
author = {Kurzban, Robert}, 
title = {An opportunity cost model of subjective effort and task performance}, 
journal = {commonsenseatheism.com}, 
volume = {}, 
number = {}, 
pages = {}, 
year = {}, 
abstract = {}, 
location = {}, 
keywords = {}}
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