How does the black market work?

[Jon]

I find it interesting and cool how the whole underground market works can anyone explain it more deeply like the process and how they stay low key.

[Heid]

uhh, ... what have you got for sale, exactly !

[Winston Chau]

A black market or underground economy is the market in which illegal goods are traded. Due to the nature of the goods traded, the market itself is forced to operate outside the formal economy, supported by the established state power. Typically the totality of such activity is referred to with the definite article as a complement to the official economies, by market for such goods and services, e.g. "the black market in bush meat" or the state jurisdiction "the black market in China".

There is no single underground economy; there are many. These underground economies are omnipresent, existing in market oriented as well as in centrally planned nations, be they developed or developing. Those engaged in underground activities circumvent, escape or are excluded from the institutional system of rules, rights, regulations and enforcement penalties that govern formal agents engaged in production and exchange. Different types of underground activities are distinguished according to the particular institutional rules that they violate. Five specific underground economies can be identified:

criminal acts
the illegal economy
the unreported economy
the unrecorded economy
the informal economy

The "illegal economy" consists of the income produced by those economic activities pursued in violation of legal statutes defining the scope of legitimate forms of commerce. Illegal economy participants engage in the production and distribution of prohibited goods and services, such as drug trafficking, arms trafficking, and prostitution.

The "unreported economy" consists of those economic activities that circumvent or evade the institutionally established fiscal rules as codified in the tax code. A summary measure of the unreported economy is the amount of income that should be reported to the tax authority but is not so reported. A complementary measure of the unreported economy is the "tax gap", namely the difference between the amount of tax revenues due the fiscal authority and the amount of tax revenue actually collected. In the U.S. unreported income is estimated to be $2 trillion resulting in a "tax gap" of $450–$500 billion.

The "informal economy" comprises those economic activities that circumvent the costs and are excluded from the benefits and rights incorporated in the laws and administrative rules covering property relationships, commercial licensing, labor contracts, torts, financial credit and social security systems. A summary measure of the informal economy is the income generated by economic agents that operate informally. The informal sector is defined as the part of an economy that is not taxed, monitored by any form of government, or included in any gross national product (GNP), unlike the formal economy. In developed countries the informal sector is characterized by unreported employment. This is hidden from the state for tax, social security or labour law purposes but is legal in all other aspects. On the other hand, the term black market can be used in reference to a specific part of the economy in which contraband is traded.