<li class="title">标题1：Altruism, Egoism, and Genetic Fitness: Economics and Sociobiology </li><li class="author">作者：Gary S. Becker </li><li class="sourceInfo"><cite>期刊：Journal of Economic Literature</cite>, Vol. 14, No. 3 (Sep., 1976), pp. 817-826 &nbsp;&nbsp;(article consists of 10 pages) </li><li class="sourceInfo">链接：<a href="http://www.jstor.org/pss/2722629">http://www.jstor.org/pss/2722629</a></li><p class="sourceInfo"></p><li class="title">标题2：A Theory of Social Interactions </li><li class="author">作者：Gary S. Becker </li><li class="sourceInfo"><cite>期刊：The Journal of Political Economy</cite>, Vol. 82, No. 6 (Nov. - Dec., 1974), pp. 1063-1093 &nbsp;&nbsp;(article consists of 31 pages) </li><li class="sourceInfo">链接：<a href="http://www.jstor.org/pss/1830662">http://www.jstor.org/pss/1830662</a></li>

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