非货币金融资产和经营收益率的U形关系——来自我国上市非金融公司的金融化证据
비화폐금융자산화경영수익솔적U형관계——래자아국상시비금융공사적금융화증거
U-shape Relationship between Non-currency Financial Assets and Operating Profit: Evidence from Financialization of Chinese Listed Non-financial Corporates