@article{oai:repository.dl.itc.u-tokyo.ac.jp:00017272,
 author = {Ohkawa, Takao and Okamura, Makoto},
 issue = {3-4},
 journal = {社會科學研究},
 month = {Mar},
 note = {application/pdf},
 pages = {55--64},
 title = {Social Inefficiency of Entry under Imperfect Competition : A Consistent Explanation},
 volume = {55},
 year = {2004}
}