Business ethics, Should Companies Subscribe to Codes of Corporate Social Responsibility?

Should companies subscribe to codes of corporate social responsibility? Support your response with reference to ethical theory. illustrate your case with examples including instances from real life of companies which do (or do not) have CSR codes. what i think need to be in the assignment: include fair trade as example of CSR the argument for and against CSR could briefly mention Milton Friedman and freeman. reference to ethical theory such as :corporate governance, normative ethical theories (ethical absolutism and ethical relativism) , conseqentialist theory (utilitarianism and egoism), non-conseqentaist theory (ethics of duty and justice) , Rawlsian theory.