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1 Introduction ÒýÑÔ²¿·ÖÖ¸³ö»éÅ䣨Assortative Matching£©Ñо¿µÄÖØÒªÐÔÓëÏÖÓÐÀíÂÛ¡¢Êý¾Ý¡¢·½·¨È±¿Ú£¬Ã÷È·±¾Ñо¿Ä¿±êΪÌá³öÁ¬Ðø£¨×¼Á¬Ðø£©ÌØÕ÷ÏÂÁé»îÇÒÎȽ¡µÄ»éÅä·ÖÎö·½·¨£¬²¢ÀûÓúÉÀ¼È«Á¿Ë°ÎñÃæ°åÊý¾Ý£¨»éʱÊÕÈë¡¢´óÑù±¾¡¢µÚÈý·½É걨£©À´Ê¶±ðÊÕÈë»éÅäµÄ¾Ö²¿ÒìÖÊÐÔ£¨PAMÓëNAM²¢´æ£©£¬Í¬Ê±³ÎÇåʹÓõ±ÆÚÊÕÈë¡¢ÒÑÓмò»¯ÐÎʽ¿ÉÄܵ¼ÖÂµÄÆ«Îó¡£
2 Theoretical Background ÀíÂÛ±³¾°ÖУ¬Ñо¿ÈËÔ±»Ø¹ËÁËÁ½Àà±ð£¨¸ß/µÍ£©ÏµĻéÅ侨ÕóÓëPAM/NAM¶¨Òå¡¢³¬Ä££¨supermodular£©Óë´ÎÄ££¨submodular£©¶ÔÓ¦¹ØÏµ¡¢¿É·ÖÀ뼫ֵ£¨SEV£©Ä£ÐÍÉ趨£¨Ó¯Óàsurplus=È·¶¨ÐÔ²¿·ÖSIJ+ÌØÒìÆ«ºÃËæ»ú³å»÷¦Åix+¦Çjy£¬³å»÷¶ÀÁ¢·þ´ÓµÚÒ»À༫ֵ·Ö²¼Type 1 extreme value£©£¬µ¼³ö¹Û²âÆ¥Å䯵ÊýÓëSIJµÄ¹ØÏµÎª¦ÌIJ=exp(SIJ-uI-vJ)£¬µ¥Éí´¦S¹éһΪ0£¬±ß¼ÊÔ¼ÊøÎª¦ÌI+=NIf¡¢¦Ì+J=NJm£¬¾ùºâ¶ÔӦ͹ÓÅ»¯¶Ôż¿ÉתΪ¼ÓȨ²´Ëɻعé¹À¼Æ£»Ö¸³öSEVϽṹÐÔ»éÅäģʽ£¨³¬Ä£ÐÔ£©¿É´ÓÒÑ»é·ò¸¾Êý¾Ý£¨²»Ðè singles£©Ê¶±ð£¬ÒòÆäÂú×ãÎ޹ر¸Ñ¡Ïî¶ÀÁ¢ÐÔ£¨IIA£©ÌØÐÔ¡£
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