Ideologies may range along a spectrum from those inform by socialism--the public ownership of land and capital administered for the community good to – capitalism-- the private ownership of resources to produce commodities for profit and reinvestment. Ideologies often couple economic aims with powerful unifying goals, such as nationalist resistance to foreign domination or reaffirmation of traditional moral or religious principles, capable of facilitating alliances among a society's major social classes. The primary function of revolutionary ideology is to provide as many people as possible with the same or at least compatible viewpoint on the need to change society so that they will be motivated to cooperate revolutionary struggle.