斯德哥尔摩大学的乔治·瓦洛蒂加拉和斯蒂法诺·葛兰达似乎通过数学模型找到了答案。
Giorgio Vallortigara and Stefano Ghirlanda of Stockholm University seem to have found the answer via mathematical models.
达特茅斯大学的经济学教授大卫·布兰·法罗以及奥斯瓦德先生研究了72个国家的数据。
David Blanchflower, professor of economics at Dartmouth College, and Mr Oswald looked at the figures for 72 countries.
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