politics, economics and naturality
Combination of liberalism and capitalism forms a nice balance. Former fights against nature in the political domain and destroys outliers by eliminating actual differences in a discrete fashion. Latter fights for nature in the economic domain and creates outliers by amplifying potential differences in a continuous fashion. (Fighting against nature results in discrete as opposed to continuous change.)
Similarly, combination of conservatism (fighting for nature in the political domain) and communism (fighting against nature in the economic domain) forms a nice balance as well. But both combinations are hard to maintain due to their conflictual nature.