The position of commercial law in the united civil law and merchant law system

Since the 20th century,with the development of market economy,the public law is in the direction of private law.The boundaries of the commercial law become fuzzy,and law of economy develops rapidly,so the position of the commercial law is already being more challenged.But in the system that civil law and merchant law are united,the commercial law is still a relatively independent legal department.Because it is both different from the civil law and different from the economy law.