New business practices are mainly characteristic of large firms, especially those quoted on the stock market. Listed companies show a higher commitment to corporate social responsibility (CSR) practices because capital markets allow activists to become a firm's socially oriented shareholders....

Sector investment has grown significantly in international stock markets an also in the Spanish one, during the last few years. Among other issues, sector portfolio managers need to estimate accurately the beta of their portfolios in order to carry out more efficient investment strategies....