Monopoly is and always has been the problem. All ideologies and political philosophies hate monopoly. Most political and economic ideologies arose as a reaction to some kind of monopoly—be it economic, political, religious, or power-based. But each defines "monopoly" differently.

The liberal hates state monopoly; the socialist hates private monopoly; the anarchist hates both; the fascist hates individual monopoly and wants collective monopoly under the state etc.

What all these currents have in common is their rejection of power concentrated in a single entity—be it the state, the market, a social class, a religion, or an individual. The basis of this is the distrust of the concentration of power. As Montesquieu said, “Every man who has power is tempted to abuse it.”

All serious political ideologies arise from a critique of the monopoly of power —but they differ completely on: who holds the power and who should control it.

Epistemologically, all political ideologies derive from a view of power (Foucault, Weber). What is more, monopoly breeds inefficiency and abuse (Smith, Ricardo, Hayek, Marx in opposite directions) and the concentration of power threatens freedom and justice (Montesquieu, Locke, Kant).