• This study has the purpose of analyzing qualitative researches in the core theories of Law. It shows a view on substantive issues, which requires a profound approach, which is not always used by the traditional literature. It also shows the application of methods from the Common Law system by the courts of Justice, mainly by the Supreme Court, a system of principles often disoriented, that follows a positivist doctrine, that venerates the Republic Constitution and turn other laws in textual norms. Another finding was the profound link with the economy. Nowadays, there are no social disputes that are out of the economic fulcrum. The research seeks to raise the relevant issues, offering options for a new course of action.