Just a quick refresh fo this interesting concept from Wikipedia’s definition:

In economics, collective bargaining, psychology, and political science, a free rider (or freeloader) is someone who consumes a resource without paying for it, or pays less than the full cost. The free rider problem is the question of how to limit free riding (or its negative effects). Free riding is usually considered to be an economic problem only when it leads to the non-production or under-production of a public good (and thus to Pareto inefficiency), or when it leads to the excessive use of a common property resource.

The term free rider comes from the example of someone using public transportation without paying the fare. If too many people do this, the system will not have enough money to operate. Another example of a free rider is someone who does not pay his or her share of taxes, which help pay for public goods that all citizens benefit from, such as roads, water treatment plants, and fire services.

Did you know any free rider ?