Its focus is on the production and exchange of things with real value by local enterprises run by people who have a stake in them, their owners. Its purpose is for all its participants. Its fairness and efficiency depend on rules and on ethical culture. It uses competition only to stimulate efficiency and innovation, not to drive its competitors out of the market. It embraces the principle that assets should be locally owned and that the full cost of any good or service should be borne by its users.
Market economies are by their very nature friendly towards communities and eco-systems.
This predates Marx who probably never used the term but perhaps was influenced by its definition. Latter-day leftists from the East as well as the West have, on the other hand, spoken of the rise of monopoly capitalism and its inevitable mergers, crisis and ultimate doom. Capitalism's 18th century definition refers to an economic and social regime in which the ownerships and benefits of productive assets were appropriated by the few to the exclusion of the many. Its driving force is using money to make money by any means available to those who already have a great deal. Its preferred organizational form is the publicly traded limited liability corporation which institutionalizes absentee ownership and makes it possible to from public accountability.