ABSTRACTThis essay contrasts the careers of Robert Ball and Wilbur Cohen, two American public administrators who have devoted fifty years to America's social insurance institutions, with other types of public actors, especially the in and outer rising spirally across departments, policies and administrations. America's separation of powers and federalism reward with influence those who combine entrepreneurial energy, long-term program commitment, and managerial skill; other political structures provide different patterns of opportunities and constraints. It then applies this perspective to Ball and Cohen's participation in three periods of American social policy history: the formation of federal social insurance policy (1935 to 1950); the expansion period (1950–1970); and the turbulent period of stagflation and fiscal stress (1972 to the present).
Relevance of Input Data Time Series for Tax Revenue Forecasting
