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2008-5-30

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��Melitz(2003)��ҵó��ģ��͹��ó��ҵ�Ĳ��ͳ��ھ��Ϊ��Melitz��ҵ��̬��ҵģ��Hopenhayn's(1992)һ��µ�¢�Ͼ��̬��ҵģ��Ϊ��չ��Krugman(1980)��ó��ģ�ͣ�ͬʱ��ҵ��ʲ��졣��ͬһ��ҵ�ڲ��ͬ��ҵӵ�в�ͬ��ʷǳ��ձ飬��ͬ��ҵ�ڽ��ò�ҵʱ��ٲ��ɳ��Ͷ�ʵĳ�ʼ��ȷ��Ҳ��ͬ��г�Ҳ��гɱ��ģ��ҵ��˽��״��֮��Ż��ھ��ߡ�Melitz(2003)��о��ʾó��ܹ��ʽϸߵ��ҵ��г��ʽϵ͵��ҵֻ�ܼ��Ϊ��г��˳��г��ó�׽�һ��ʹ��Դ��ã��ʽϸߵ��ҵ��ҵ��Դ��û��ߣ��͵ĸ��ǰ��ó��û�н��͹��ó��á�һ��ҵ��ŵ�ó�׿��Ž��߹��ʺ��Ҫ�ؼ۸��ʹ��͵��ҵ��˳��г��ߵ��ҵ��ܹ��е��Ӫ��Ĺ̶��ɱ��ʼ��ڣ��ʾ��ε��ҵ��Ϊ��г��佫��Щ��ʽϸߵ��ҵ��Ϊ��Щ��ҵ��Ϊ��г��ҲΪ��г��͵��ҵ�Ѿ��˳��г��ҵ��Ϊ��ó�׶��õ��˰��ɱ��ӳ��г��ģʱ��ҵ��Ҳ��õ��Ӧ��ߣ��Щó�״�ʩ��߱��ͳ��г��۵�ƽ��ʡ�

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