Inside economics, a market in which runs under laissez-faire policies is a free market. It is “free” in the sense that the government makes no try to intervene through fees, subsidies, minimum wages, price ceilings, etc. Market prices could be distorted by a seller or sellers with monopoly power, or a customer with monopsony power. Such price distortions may have an adverse effect on market participant’s welfare and reduce the efficiency of market outcomes. Also, the relative amount of organization and negotiating power of buyers and sellers substantially affects the functioning from the market. Markets where price negotiations meet equilibrium though still usually do not arrive at wanted outcomes for each sides are said to experience market failing.

Markets are a system, and systems have got structure. System works fine when the structure of a system is in good shape. Structure of a (utopistically) well-functioning markets is defined in theory of perfect competition. Well-functioning markets of the real world are never perfect, but basic structural characteristics can be approximated for real world markets, for example
many small buyers and sellers
buyers and sellers have equal use of information
products are similar

Buying and promoting in well-structured markets creates an amount that satisfies each buyers and sellers, not buying and selling alone since the free market proponents tells us. For example, trade unions are now and again accused of spoiling industry mechanims of a labour markets, in reality it is the opposite: blue collar business unions make the client and seller a lot more equally powerful if they negotiate the price for a working hour. When the customer and seller are equally powerful, then the price for a commodity is acceptable to both parties.