 Political economy thus seeks a concept of governance that relies only on incentives; it consequently denies the existence of legal systems in Hart’s sense. It might nonetheless acknowledge a different concept of law. Some political economists, for example, suggest that legality in the sense of an impartial “rule of law” promotes economic growth. The political economist then might identify law or legal systems as those governance structures that realize such a rule of law (in given circumstances). The political economist, then, might adopt two related concepts. The first concept of a governance structure is an explanatory one; it characterizes the mechanisms of social governance in terms of the degree of institutional differentiation and the mechanism of bureaucratic control within these institutions. The second related concept is normative. It identifies a value that a governance structure might realize. Call this value legality. The concept of law is thus a normative one; that identifies the value of legality. The social scientist then seeks to identify conditions under which specific governance structures will realize the value of legality.