The classical linear scale is one-dimensional and fails to distinguish between economic and social liberties. For instance, it cannot differentiate between authoritarian communists and libertarian socialists. Using two axes allows for the separation of state economic regulation from personal freedom issues.
Centrists are individuals with moderate views who do not support radical market reforms or total state control. On the graph, they are located near the intersection of the axes, representing a balance between different ideologies depending on the specific context.
In the context of the political compass, authoritarianism refers to the belief that state institutions should have enough power to maintain social order and stability. It is not necessarily support for tyranny, but rather a preference for collective and state interests over absolute individual liberty.