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| David Zhong requests your endorsement to submit an article to the econ.TH section of arXiv. To tell us that you would (or would not) like to endorse this person, please visit the following URL: https://arxiv.org/auth/endorse?x=4RBS4W If that URL does not work for you, please visit http://arxiv.org/auth/endorse.php and enter the following six-digit alphanumeric string: Endorsement Code: 4RBS4W 求大拿帮忙点击背书  ，加微信号wxid_34w2ryucji4422 |
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