The spontaneous (natural) order is composed of informal tacit contracts such as customs or conventions.

Free market is the most widely used spontaneous order in liberal studies, as a type of regularity in human affairs and a product of evolution of social practices. Thus, it is an outcome of human experience and collective result of trial and errors.

The related assumptions are based on the “laissez faire” (non-intervention) understanding so that state acts as an arbiter in disputes between individuals and ensures the conditions under which individuals can enjoy their rights.

In this connection, classical liberals accept that order is possible as a result of customs, traditions and societal institutions. Smith’s explanation of the free market and his famous example the invisible hand denotes such understanding. Free market then is all about the bartering and division of labor inherent to humans. The self interest of the humans have resulted in a system whereby other individuals could also find products and services for their consumption. The relationship between liberty, economic growth and progress were thought as the unintended consequences of the human action and evolved into the capitalist system.