First of all, the law of supply and demand is a law of economics, not a capitalist principle. A capitalist principle applies in that the individual sell and buy decisions that cumulatively represent “supply and demand” be strictly voluntary--that all supply (production) be the result of people freely exercising their rights to work for his own livelihood, each keeping and using what he earns, each filling his own “demand” through voluntary trade with others for mutual benefit, each in accordance with his own self-interest.
The communist principles of ability and need--“From each according to his ability to each according to his need”--holds that government must forcibly commandeer all earnings for the purpose of distributing the proceeds according to what it determines are each person’s needs, regardless of each person’s productive contribution and regardless of the actual needs, personal choices, or self-interest of any individual.
The capitalist principles relating to the economic law of supply and demand and communist principle of “From each according to his ability to each according to his need” are antithetical, on principle. The crucial differences are several; voluntarism vs. force, justice vs. injustice, individual self-determination vs. central control, rights-protecting constitutional government vs. totalitarianism, freedom vs. slavery.
QUORA *: ‘Why do people find communism so terrifying as an idea?’
Why Capitalism Needs a Moral Sanction
The Dollar and the Gun—Harry Binswanger
* [Quora is a social media website founded by two former Facebook employees. According to Wikipedia:
Quora is a question-and-answer website where questions are created, answered, edited and organized by its community of users. The company was founded in June 2009, and the website was made available to the public on June 21, 2010.Quora aggregates questions and answers to topics. Users can collaborate by editing questions and suggesting edits to other users' answers.
You can also reply to other users’ answers.]