Budget theory is the academic study of political and social motivations behind government and civil society budgeting. Classic theorists in Public Budgeting include Henry Adams, William F. Willoughby, V. O. Key, Jr., and, more recently, Aaron Wildavsky. Notable recent theorists include Frank R. Baumgartner, Bryan D. Jones, Richard Fenno, Allen Schick, Dennis Ippolito, Naomi Caiden, Irene Rubin, James D. Savage, Thomas Greitens, Gary Wamsley, and Usman W. Chohan. Budget theory was a central topic during the Progressive Era and was much discussed in municipal bureaus and other academic and quasi-academic facilities of that time such as the nascent Brookings Institution. The executive budget in United States was a financial innovation designed to empower city mayors and city managers with the capacity to implement needed policy reforms in the Progressive Era. Since that time, the executive budget has become a tool by which the president of the United States has been able to substantively shape policy and draw power to the president from Congress, which was originally charged with "holding the purse" (and still is constitutionally, as there is no federal-legislative authority to change the constitution outside the amendment process or for congress to legislate away their authority). This has resulted in an ever increasing role and power base for what is now called the Office of Management and Budget. Budget, Civil society and Constitutional economics Constitutional economics is a field of economics and constitutionalism which describes and analyzes the specific interrelationships between constitutional issues and functioning of the economy including budget process. The standards of constitutional economics when used during annual budget planning, as well as the latter's transparency to the society, are of the primary guiding importance to the implementation of the rule of law. Also, the availability of an effective court system, to be used by the civil society in situations of unfair government spending and executive impoundment of any previously authorized appropriations, becomes a key element for the success of any influential civil society. The term “constitutional economics” was used by American economist – James M. Buchanan – as a name for a new academic sub-discipline that in 1986 brought him the Nobel Prize in Economic Sciences for his “development of the contractual and constitutional bases for the theory of economic and political decision-making.” Buchanan rejects “any organic conception of the state as superior in wisdom, to the individuals who are its members.” This philosophical position is,