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First Author:
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| Kazufumi Yamana |
| Graduate School of Economics, Hitotsubashi University |
| kz.yamana@gmail.com |
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| Naka, 2-1 |
| Kuntiachi, 186-8601, Japan |
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Second Author:
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| Makoto Nirei |
| Institute of Innovation Research, Hitotsubashi University |
| mnirei@gmail.com |
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| 2-1, 2-1 |
| Kuntiachi, 186-8601, Japan |
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