The work of G. Bergantiños is partially supported by research grants ECO2014-52616-R from the Spanish Ministry of Science and Competitiveness, GRC 2015/014 from "Xunta de Galicia", and 19320/PI/14 from Fundación Séneca de la Región de Murcia. J. Massó acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centres of Excellence in R&D (SEV-2015-0563) and grant ECO2014-53051, and from the Generalitat de Catalunya, through grant SGR2014-515. The paper was partly written while J. Massó was visiting the Department of Economics at Stanford University; he wishes to acknowledge its hospitality as well as financial support from the Ministerio de Educación, Cultura y Deporte through project PR2015-00408. The work of A. Neme is partially supported by the Universidad Nacional de San Luis, through grant 319502, and by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET),through grant PIP 112-200801-00655.
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机译：G.Bergantiños的工作得到了西班牙科学和竞争力部的ECO2014-52616-R，“ Xunta de Galicia”的GRC 2015/014和FundaciónSénecade laRegiónde的19320 / PI / 14的部分研究资助。穆尔西亚。 J.Massó承认西班牙经济与竞争力部通过Severo Ochoa R＆D卓越中心计划（SEV-2015-0563）并授予ECO2014-53051的资金支持，以及加泰罗尼亚共和国通过SGR2014- 515。该论文的部分撰写是在J.Massó访问斯坦福大学经济学系时进行的。他希望通过PR2015-00408项目感谢其热情好客以及文化和体育部的部长级财政支持。 A. Neme的工作部分获得了国立圣路易斯大学的319502赠款的支持，并得到了国立中央调查技术大学（CONICET）的资助（PIP 112-200801-00655）。
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