Petkova,Ralitsa,DotheFama-Frenchfactorsproxyforinnovationsinpredictivevariables?Journaloffinance,Apr2006,61(2):581-612
事实上也是如此,百强企业yZS0占有率和TOP10企业市场集中度不断提升,尤其是TOP10的头部公司,提升速度更加明显f5yi