In the academic discipline of economics, there are two theoretical extremes of economic systems: pure market and pure command. They are theoretical because there are and have never been any real-world examples of either type of economic system.
Individuals or groups of individuals choose who will work to produce goods in a pure market system. There is no government interference such as equal employment laws, anti-discrimination laws or affirmative action.
What Is Produced
In a pure market system, individuals or groups of individuals choose themselves what they wish to produce. Governments do not interfere in such forms as anti-trust or anti-monopoly laws.
How Much Is Produced
Once an individual or groups of individuals decide what to goods to produce, they also decide how much to produce and at what rate. There is no government subsidization or decreed maximum/minimum levels of production.
How Much Produced Goods Cost
After goods are produced, entities that produced them choose how much they will cost and generally try to earn as much money for the goods as possible. There are no government regulations on charging too much or too little, no taxes and no tariffs.
Who Receives Produced Goods
After goods are produced, they are sold to the highest bidder, aka highest paying consumer without any government interference. Consumers generally try to get goods for the lowest price possible. In a pure market system, the equilibrium prices of goods are the results of compromises between goods producers and consumers.