Industrial relations scholarship assumes that labour markets are not perfectly competitive and thus, in contrast to mainstream economic theory, employers typically have greater bargaining power than employees. Industrial relations scholarship also assumes that there are at least some inherent conflicts of interest between employers and employees (for example, higher wages versus higher profits) and thus, in contrast to scholarship in human resource management and organizational behaviour, conflict is seen as a natural part of the employment relationship. Industrial relations scholars therefore frequently study the diverse institutional arrangements that characterize and shape the employment relationship—from norms and power structures on the shop floor, to employee voice mechanisms in the workplace, to collective bargaining arrangements at company, regional, or national level, to various levels of public policy and labour law regimes, to varieties of capitalism (such as corporatism, social democracy, and neoliberalism).