Umino's Conaons Dileua Lodel Reconsidered: On its Validity and Implications

Umino's commons dilemma model aims to formulate “the tragedy of the commons”. However, Misumi pointed out that (l)this model failed to formulate “the tragedy of the commons”, and that (2)this model was also inappropriate for a model of social dilemma. This paper re-examines Umino model on the second point above. At first, the discussion by Misumi as to (2) is inappropriate. Finally, I fundamentally agree with the conclusion by Misumi again. However, I simultaneously clarify that it is possible for Umino model to formulate the dilemma situation where costs are equal among actors, and moreover the redistribution system is introduced.