"The first and the purest demand of society is for scientific knowledge: knowledge of how the economic system works. Knowledge of the consequences of economic actions. Knowledge of the causes of unemployment, of the effects of various taxes, of the sources of income inequality. Whether one is a conservative or a radical, a protectionist or a free trader, a cosmopolitan or a nationalist, a churchman or a heathen, it is useful to know the causes and consequences of economic phenomena."