Liberalism played a key role in the evolution of capitalism as both an ideology and a set of historical practices that have served to undermine the expansion of democracy over time. Liberal ideology posited, to the contrary, that commerce ought to chiefly benefit the private power of the individual. This form of economic liberalism supports capitalism by championing the liberty of individuals to maximize their own economic self-interests. Liberalism was and is the political factor that best represents progressive education and its underlying philosophic assumptions. I. Katznelson asks what a radical liberalism would look like in the face of latest increases in capitalist global power. He also wonders whether liberalism's limitations are inherent in its development and present position in relation to capitalism. The commonalities between liberalism and antiliberalism may be grounded in the former's belief in natural law. Nature is viewed as conservative because it is allegedly based on an "unshakable constancy of appearance" even if temporary disturbances occur.