Social structure theories bring a sociological (rather than biological or psychological) approach to studies of crime and deviance. Instead of focusing solely or primarily on individuals, these theories seek to explain how individuals are situated within and experience larger-scale social institutions such as schools, government, the labor market, cultural industries, and the criminal justice system. Over the years, theorists have proposed mainstream or consensus theories of social structure as well as critical or conflict theories of structure. According to mainstream or consensus theories, social structures serve to regulate and socialize individuals to conform to dominant social norms, rewarding some behaviors while penalizing others. In contrast, according to critical social structure theories, social, economic and political power serve as barriers that impede, constrain, or shape what is possible for people in specific societal contexts, largely based on characteristics such as class, ethnicity, gender, or sexuality.