caa a22 4500 475797876 CHVBK 20180406123729.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/BF01227496 doi (NATIONALLICENCE)springer-10.1007/BF01227496 Matsumura Toshihiro Institute of Social Science, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan aut Entry regulation and social welfare with an integer problem [Elektronische Daten] [Toshihiro Matsumura] This paper elaborates on Salop (1979) who showed that the number of firms at free-entry equilibrium is excessive from the viewpoint of social welfare (excess-entry theorem). This paper considers an integer problem of the number of firms entering the market. We find that the excess-entry theorem does not hold true if the marginal production cost is increasing, while it holds true if the marginal production cost is constant. This result warns against the use of the excess-entry theorem for rationalizing entry regulation such as the notorious Japanese Large-Scaled Retail Act restricting the new entry of retailers. Springer-Verlag, 2000 entry regulation nationallicence excess entry nationallicence integer problem nationallicence L13 nationallicence L51 nationallicence Journal of Economics Springer-Verlag 71/1(2000-02-01), 47-58 0931-8658 71:1<47 2000 71 712 https://doi.org/10.1007/BF01227496 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01227496 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Matsumura Toshihiro Institute of Social Science, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-0033, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Economics Springer-Verlag 71/1(2000-02-01), 47-58 0931-8658 71:1<47 2000 71 712 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer