The political principle that underlies the market mechanism is unanimity. In an ideal free market resting on private property, no individual can coerce any other, all cooperation is voluntary, all parties to such cooperation benefit or they need not participate. There are not values, no “social” responsibilities in any sense other than the shared values and responsibilities of individuals. Society is a collection of individuals and of the various groups they voluntarily form.
The political principle that underlies the political mechanism is conformity. The individual must serve a more general social interest–whether that be determined by a church or a dictator or a majority. The individual may have a vote and say in what is to be done, but if he is overruled, he must conform. It is appropriate for some to require others to contribute to a general social purpose whether they wish to or not.