The main dimensions of Marx's discussion of alienation are as follows:...
1. The worker … has no power to determine the fate of what he produces....
2. The work task does not offer intrinsic satisfactions....
3. Human relations, in capitalism, tend to become reduced to operations of the market. … Money promotes the rationalization of social relationships, since it provides an abstract standard in terms of which the most heterogeneous qualities can be compared, and reduced, to one another....
4. Some animals do produce, of course, but only in a mechanical, adaptive fashion. Alienated labor reduces human productive activity to the level of adaptation to, rather than active mastery of, nature.

pp. 12-13. - Capitalism and Modern Social Theory (1971)