Laffer curve costs). Although tax policy is often mentioned in relation to supply-side economics, supply-side economists are concerned with all impediments to the supply of goods and services and not just taxation. In their economics textbook "Principles of Economics" (7th edition), economists Karl E. Case of Wellesley College and Ray Fair of Yale University stated "The Laffer curve shows the relationship between tax rates and tax revenues. Supply-side economists use it to argue that it is possible to generate higher revenues by cutting tax rates, but evidence does not appear to support this. The lower tax rates by the Reagan administration decreased
To each according to his contribution as a system whereby the laborer receives the full product of his labor through the elimination of exploitation and accrual of unearned income to a capitalist class. The term means simply that each worker in a socialist society receives compensation and benefits according to the quantity and value of the labor that he or she contributed. This translates into workers of high productivity receiving more wages and benefits than workers of average productivity, and substantially more than workers of low productivity. An extension of this principle could also be made so that the more difficult one's job is—whether this difficulty