Mercantilism emphasizes government intervention to enhance state power through economic means, advocating for a balance of payments surplus, strong military, and maximum exports. The liberal critique argues that mercantilist policies, characterized by a 'beggar thy neighbour' approach, are detrimental, promoting instead free trade based on comparative advantage without state interference. Liberals believe that rising prices harm the economy, contrasting with mercantilist views that support price increases as beneficial.