Laffer curve is simplistic in that it assumes a single tax rate and a single labor supply. Actual systems of public finance are more complex, and there is serious doubt about the relevance of considering a single marginal tax rate. In addition, revenue may well be a multivalued function of tax rate; for instance, an increase in tax rate to a certain percentage may not result in the same revenue as a decrease in tax rate to the same percentage (a kind of hysteresis). Furthermore, the Laffer curve does not take explicitly into account the nature of the tax avoidance taking place.
From each according to his ability, to each according to his needs if any member of society has an unsatisfied need, each member has a duty to produce its object (if they can). But that is precisely what the principle ‘from each according to their abilities, to each according to their needs!’ dictates. In Marx’s vision, the basic principle of developed communism is a principle of solidarity in respect of need.' Marx delineated the specific conditions under which such a creed would be applicable—a society where technology and social organization had substantially eliminated the need for physical labor in the production of things, where "labor has become not only a means of