| Polanyi, 1957 | Individual networks for the exchange of services and products in scarcity that follow the principle of reciprocity, client structures within state bureaucracy (redistribution) and illicit production of goods and services distributed through the black market. | 87 | Economic Social Political Ethical |
Klein & Tokman, 2000, pp. 7–30 | Activities not recognized, registered, protected or regulated by public authorities. | 25 | Economic Legal Political |
| Hart, 1997, pp. 61–89 | Marginal activities—other than the formal and non-formal sector—that provide income to the poor and a safety-net in times of crisis. | 35 | Economic Social Political Ethical |
Moser, 1978, pp. 1041–1064 | Economic units (micro-businesses) and subordinate workers that help to reduce input and labor costs, thereby increasing the competitiveness of big business. | 98 | Economic Legal Political Labor |
| Vivancos, 1989 | Heterogeneous group of production and marketing activities not subject to accountancy controls or that may be openly illegal. | 83 | Economic Legal Ethical |
Feige, 1990, pp. 989–1002 | Economic activities that ignore the costs of complying with laws and administrative regulations governing "ownership relationships, commercial licensing, employment contracts, liabilities, financial credit and social security systems" and are excluded from all such protections. | 97 | Economic Legal Labor |
| Portes, 1995 | The forms of subordination of labor to capital and an expression of the modes of production carried out at the level of the urban economy, similar to that previously performed in the area of the agricultural economy. | 171 | Economic Legal
Social Labor |
| Castells, 1998 | Systematic effort by companies in the formal sector to evade or disassociate themselves from the legal requirements of labor protection, through the method of outsourcing that lacks formal employment benefits, in order to substantially reduce labor costs and tackle cut-throat global competition. | 51 | Economic Legal Labor |
| de Soto, 2000 | It is made up of "intrepid" micro-entrepreneurs who choose to work informally to avoid the costs, time and effort of formal registration, and also of those who would need property rights to make their assets legally recognized. | 39 | Economic Legal |
Gomez, 2007, pp. 7–30 | Ability to absorb self-created employment and its relationship with the modern production sector, which is the result of changes in the economy and the labor market. | 8 | Economic Legal Political Medioambiental Cultural Ethical
Labor |
| Parra, 2003 | A set of economic activities carried out by workers and economic units which, both in law and in practice, are insufficiently covered by formal systems. The activities of these individuals and companies are not covered by legislation, which means that they operate outside the law; or they are not covered in practice, i.e. that legal regulations are not applied or not enforced; or the legislation itself causes incompliance because it is seen as inadequate, cumbersome or it imposes excessive costs. | 37 | Economic Legal Political Labor |
| Méndez, 2002 | Individual and commercial subsistence activities, dislocated from their social base. | 2 | Economic Social |
| Icaza & Tiribia, 2003 | Activities that, although carried out within social sectors, do not fall within the classification of social economy, but rather within the informal economy. | 7 | Social |
| WIEGO, 2003 | All of the economic units, activities and workers thus defined, as well as the results of their production, that together form, both domestically and globally, the broad base of the workforce and the economy. | 68 | Economic Social Labor |
| International Labour Organization, 2010 | All of the economic activities carried out by workers and economic units which—for both legal and practical purposes—are not covered or are insufficiently covered by formal systems. | 9 | Economic Legal Social Political Labor |
| Bertranou, 2007 | Self-employed workers performing subsistence activities alongside others who carry out unsalaried activities that generate income and a certain contributory capacity. | 2 | Economic Labor |
| Iranzo, 2007 | Employment activities that are not legally registered and therefore do not pay taxes and have little chance of economic growth. | 7 | Economic Legal Labor |
| Programa Regional del Empleo para América Latina y el Caribe, 2007 | An ensemble of small-scale economic activities engaged in the production and distribution of goods and services with a weak capital-to-work ratio and low level of profitability and technology, and that are characterized by precariousness and vulnerability to the prevailing economic conditions in each country. | 6 | Economic Legal Social Labor |
Moyano et al., 2008, pp. 693–701 | A growing and diverse group of workers and enterprises (urban or rural) operating in non-regulated areas. | 7 | Legal Labor |
| Chen, 2012 | Principal source of jobs and livelihoods in most cities of the developing world. | 11 | Economic Social Political |
| Haller, 2014 | Unregistered or lawful economic activities; the inability of the public administration to enforce the corresponding regulations across companies and the whole population. | 4 | Economic Legal Social Ethical |
Quijano, 2004, pp. 55–83 | Those economic activities that are not recorded in the official statistics and that operate outside of administrative controls. | 2 | Economic Legal |
| (ILO, 2003, p.10) | All activities that, in law or in practice, do not fall within the remit of formal mechanisms. | 8 | Economic Legal |
| Huggins, 2007 | Self-employed activities, carried out in small, unregistered businesses. | 21 | Economic Legal |
Dominguez, 2004, pp. 10–32 | Group of activities that, for a variety of reasons, remain outside standard information systems, such as national accounting and auditing, tax records, employment statistics, legal records or the economic conceptual framework itself. | 3 | Economic Legal |
| Boyd, 2017 | A wide range of activities, from work mainly concerned with subsistence to sophisticated tasks that require high-level technical skills. | 3 | Social |
| Cervantes et al., 2008 | Entrepreneurial or individual activity not subject to legislation or lying outside of the law—at least for practical purposes—also those to which the law is not applied, or incompliance is common; especially where legislation is deficient, excessively onerous or costly. | 32 | Economic Legal |
| Moccerro, 2001 | Contraction of economic activity and non-payment of employer contributions (and other forms of evasion of responsibilities) that offer a source of finance to companies and artificially raise profitability. | 47 | Economic Legal Social Ethical Labor |
Gallart, 2005, pp. 36–47 | An income-generating process that is not regulated by social institutions in a legal environment in which similar activities are usually regulated. | 6 | Economic Legal Social Political |
| Converti, 2017 | Economic activity that is not taxed or regulated by a government, which contrasts with the formal economy including legitimate economic activity under national law. | 9 | Economic Legal Political |
| Chen, 2005, pp. 18–27 | It consists of all forms of "informal work", i.e., without employment or social protection, both within and outside of informal businesses, including self- employment in small, unregistered businesses and wage labor in unprotected jobs. | 18 | Economic Legal Social Labor |
| Breman, 1996 | Relationships between employers and workers are governed by a wide range of social customs and traditions that mitigate the sense of insecurity of poorer workers. | 96 | Legal Social Ethical Labor |
| Henriques & Herr, 2007, p.43 | Is where large numbers of poor people work. In addition to low incomes, informal work is most often characterized by poor working conditions, a lack of formal employment contracts, and very limited or no social protection. Particularly women are affected, since they form the majority of workers in this part of the economy. | 33 | Economic Legal Political Ethical Labor |
| Tripp, 1997, p. 2 | Economic activities that are subject to regulation, but which, in fact, operate outside of government controls. | 8 | Economic Legal Political Ethical Labor |
| Sassen, 1993 | Those revenue-generating activities that are carried out beyond the state's regulatory framework and are analogous to others within that framework. | 59 | Economic Legal |
Gershuny, 1979, pp. 3–15 | It contains a diverse collection of activities that can be divided into three ambits: home, community, and underground. The latter covers a wide range, from outright theft to tax evasion. | 7 | Social Political Ethical Labor |
| Mukhija & Loukaitou-Sideris, 2015 | Occur in defiance of rules, ordinances, and regulations, out of necessity, or because of opportunity. | 15 | Legal Social Political |
| Castells & Portes, 1989b, pp. 11–37 | The Non-formal and unregulated part of the market economy that produces goods and services for sale or for other forms of remuneration. | 62 | Economic Legal Social |
| Amin & Singh, 2002 | Self-employed workers assisted by family members or family workers. | 32 | Social Labor |
| Chandra & Pratap, 2001 | Unincorporated enterprises and cottage industries (other than organized ones) that are not regulated by law and do not present annual accounts or balance sheets constitute the unorganized sector. | 54 | Economic Legal Social Political |
| Geertz, 1963 | It is both an economic institution and a way of life, a general mode of commercial activity that encompasses all aspects of society. | 5 | Economic Social Political |
| Fernandez & Scheffner, 2006 | These are transactions in which the state does not provide protection or receive a "cut"; therefore, the relationship between the informal economy and the state is, by definition, inevitably one of conflict. | 23 | Economic Legal Social Political |
Apressyan, 1997, pp. 1561–1570 | Illegal use of state, financial or material resources, or outright theft, essentially parasitic in nature. | 75 | Economic Legal Political Ethical |
Chakraborty, 1997, pp. 1529–1538 | It denotes the process of the clandestine selling of scarce or rationed commodities at inflated prices. | 68 | Economic Social Ethical |
| Daza, 2015, pp. 5–17 | Economic activities of workers and economic units that—for legal or practical purposes—are not covered or insufficiently covered by formal agreements | 29 | Economic Legal Labor |
| Luna, 2006, pp. 57–63 | It consists of economic activities with different levels of complexity, with workers that are mainly self-employed and trade in basic products such as food or provide basic transport services. | 17 | Economic Social Labor |
| Sheinbaum & Lomnitz, 2005 | Those aspects that allow the poor to subsist and the middle and upper classes to maintain their social status and privileges | 23 | Social Political Ethical Labor |
| Levenson & Maloney, 1998, pp. 11–21 | It is the result of producers and traders who choose to operate informally after weighing the costs and benefits of informality versus formality, especially opportunistic informal producers and traders. | 56 | Economic Social |
Watson, 2009, pp. 151–168 | Anti-poverty policies and regulations and government systems that exclude the poorest informal producers and traders from access to formal employment, basic urban services and space in the city to live and work. | 17 | Social Political Labor |
| Centre Emile Berheim CEB, 2009, pp. 15–36 | It helps to organize society. | 32 | Social Political |
Cortés, 2000, pp. 592–618 | Economic activities with low levels of productivity that employ family members; low-paying jobs; occasional employment; urban poverty; and belts of misery on the margins of major Latin American cities. | 47 | Economic Legal Social Political Cultural Ethical Labor |
| Junguito & Caballero, 1978 | Unregistered (or over-registered) productive activities featuring in the national accounts in the agriculture, industry, trade, mining and construction sectors. These originated in the production of small-scale goods and services such as those of the agricultural mini-trader, the street trader, etc. and are carried out outside the law. | 87 | Economic Legal Social Political Ethical
|
| Williams & Youssef, 2014, pp. 41–53 | Activities in which monetary transactions are not declared to the state for taxation, social security or labor law purposes, but which are legal in all other respects. | 15 | Economic Legal Social Ethical |
Charmes, 1992, pp. 316–408 | Lawful but unregistered economic activities; although non-registration is not always synonymous with illegality, but rather may reflect the inability of the public administration to enforce the corresponding regulations for the whole population. | 65 | Economic Legal Social Political Ethical |
| Neffa, 2009, pp. 15–18 | It also includes all workers without social protection (generally referred to as unregistered) regardless of whether they are in small, medium or large enterprises, or whether urban or rural. | 32 | Economic Legal Social Political Labor |
| UN women, 2020 | Circumstances that lack the protections afforded by employment and social benefit laws such as pensions, health insurance or paid sickness allowances. | 65 | Economic Legal Social Labor |
| Coraggio & San Pablo, 1991 | Economic activities (in the sense of producing goods and services or using up scarce resources) carried out by individual or collectives that continually rely on their own labor. | 76 | Economic Social |
de Sousa, 2004, pp. 141–192 | Activities not regulated by the State | 37 | Legal Political |
| Quijano, 1998, p. 92 | A decisive factor is group identity (ethnic, regional, religious, family and political) as the main cohesive element in economic activity. | 73 | Economic Social Political |
Cacciamali, 2000, pp. 95–110 | Workers who carry out activities characterized by instability and low levels of remuneration. | 34 | Economic Social Labor |
| Bastidas & Richer, 2001, pp. 13–20 | It is the least productive employment area, with a workforce that failed to enter the modern labor market. The marginalized informal sector was destined to be re-absorbed under the pressure of global economic growth and public policy. | 6 | Economic Social Political |
Waisgrais, 2001, pp. 15–32 | It is part of a segmentation process in the labor market, including self-employed activities, domestic service or even unprotected employees. | 12 | Economic Ethical Labor |
| Carida & Lacabana, 1989, pp. 25–48 | Small-scale dependent activities, carried out with or without paid workers, which are characterized by low-level organization and technology and whose fundamental objective is to create jobs and generate income for their participants. | 23 | Economic Social Ethical Labor |
| Albalate & Bacardit, 2014, pp. 20–56 | Those activities that, being commercial, are not subject to labor and legal controls. | 7 | Economic Legal Social |
Escobar, 2014, pp. 16–67 | Activities that require greater resources and a longer-term outlook are subject to all kinds of uncertainties and risks. | 3 | Economic Social |
CIPPEC, 2009, pp. 29–96 | They are low-quality employment activities that involve irregular or low incomes, long working hours and lack of access to information, markets, finance, training and technology. | 12 | Economic Social Political Cultural Ethical Labor |
Díaz & Gálvez, 2003, pp. 18–36 | Heterogeneous set of means of production and employment, interrelated with each other, but with different dynamics and influenced both by general policies and by policies specific to some of them. | 6 | Economic Political Labor |
Saavedra, 2007, pp. 207–341 | It is the ratio of self-employment activities to full employment, and of workers without pension or social security contribution to all workers. | 19 | Economic Legal Social Labor |
| Jaller, 2007, pp. 13–54 | That which includes small producers, processing companies, traders and service providers, as well as legal and illegal activities involving a large number of artisans. | 23 | Economic Social |
| Arqué, 2005, pp. 5–41 | It is an income-generating process characterized by its avoidance of the regulations of social institutions. | 29 | Economic Legal Social |
Rodríguez, 2012, pp. 48–157 | Inability of economies to create a sufficient number of good quality jobs to absorb the workforce. | 15 | Economic Ethical Labor |
Azaïs et al., 2012, pp. 81–163 | They are street activities. | 32 | Economic Social Political |
Webb et al., 2013, pág. 598 | The informal economy consists of economic activities that occur beyond the boundaries of formal institutions but remain within informal institutional boundaries for large segments of society. | 77 | Economic Legal Social Political |
| de Soto, 1989, p. 11 | They are not “antisocial in intent” | 90 | Social Political Ethical |
| Webb et al., 2009 | From a policy point of view, another potentially effective approach to limiting the scope of the informal economy is to pressure big business in the formal economy to break its links with suppliers that operate illicitly. | 12 | Economic Social Political |
| Rutherford & Buller, 2007 | Activities, which, while illegal, remain legitimate for large portions of society. | 34 | Social Ethical |
| Centeno & Portes, 2006 | The production of legitimate goods using processes that are not fully legal. | 22 | Economic Cultural Ethical |
| Nichter & Goldmark, 2009 | Economic activities that are unregistered yet produce legal products. | 29 | Economic Legal Ethical |
| LaPorta & Schleifer, 2008, p. 1 | The informal economy is defined as “economic activity that [is] conducted by unregistered firms or by registered firms that are hidden from taxation.” | 49 | Economic Legal Ethical |
| Venkatesh, 2006 | Informal, underground, or “off-the-books” economic activity as characterized by either illicit practices (products or processes) or illicit exchanges. | 41 | Economic Ethical |
| Becker, 2004a, p. 10 | Informal work arrangements are a rational response by micro-entrepreneurs to over-regulation by government bureaucracies. | 386 | Economic Legal Political Ethical |
Andrews et al., 2011, p. 7 | Economic activities and transactions that are sufficiently hidden so that they are unmeasured or untaxed, and it is presumed that economic agents are at least passively aware that bringing these activities to the attention of authorities would imply tax or other legal consequences. | 50 | Economic Political Ethical |
| Schneider & Buehn, 2009, p. 2 | All market-based legal production of goods and services that are deliberately concealed from public authorities for the following reasons: (1) to avoid payment of income, value added or other taxes, (2) to avoid payment of social security contributions, (3) to avoid having to meet certain legal labor market standards, such as minimum wages, maximum working hours, safety standards, etc., and (4) to avoid complying with certain administrative procedures, such as completing statistical questionnaires or other administrative forms. | 37 | Economic Legal Social Ethical |
| Cortellese, 2015 | What should be formal according to the law of a state but is not. We will limit the analysis to the activities that affect public revenue and expenditure and, at the same time, cause a distortion in the market. | 21 | Legal Political |
| Randhawa, 2017 | The informal sector is characterized by easy entry and exit, small scale of operation, few employees and inability to access services in the formal sector, including finance, power and water supply. This keeps down the level of capital invested. As a result, informal enterprises generally use older cheaper technologies in the production of goods and services. | 18 | Economic Social Political Ethical Labor |
Carrasco, 2004, pp. 128–163 | It has as one of its characteristics the "lack of an employment relationship", this does not necessarily mean that the worker does not have a "boss". | 20 | Labor |
| Brown & McGranahan, 2016, pp. 91–142 | It includes economic activities that fall largely outside the scope of official regulation, either because the regulations do not apply or through a combination of their weak application and evasion. | 9 | Economic Legal Political |
International Labour Organization, 2002b, pp. 11–37 | Informal activities that are not subject to accountancy, such as production for personal consumption, paid domestic activities in private households and door-to- door work. | 5 | Economic Ethical |
| Chen, 2017, pp. 3–15 | A large proportion of economic units and workers remain outside the world of regulated economic activities and protected employment relationships. | 6 | Economic Legal |
Becker, 2004b, pp. 150–184 | It is largely characterized by low-income requirements in terms of capital and professional qualifications; a small scale of operations; skills often acquired outside of formal education; labor-intensive production methods and adapted technology. | 14 | Economic Social Ethical |
| Losby et al., 2002, p. 1 | The informal economy refers to a series of activities that, by occurring outside the arena of the normal, regulated economy, escape official record keeping. | 22 | Economic Legal Ethical |
| Levitan & Feldman, 1991 | Economy that includes monetary and non-monetary aspects. | 23 | Economic Social Political |
| Gerber, 1999, p. 1 | The informal economy "has served as a crucial survival strategy for the poor, as a significant provider of jobs to the unemployed, as a training ground for entrepreneurs, a source of new businesses, and as part of a cost reducing strategy for modern businesses." | 49 | Social Political Labor |
| Williams & Nadin, 2010, p. 363 | Paid production, as well as the sale of goods and services that are legitimate in all respects, despite not being registered or hidden from the state for tax and/or profit purposes. | 19 | Economic Legal Social Political Ethical |
| International Labour Organization, 2002a | All economic activities by workers and economic units that are—in law or in practice—not covered or insufficiently covered by formal arrangements’ | 19 | Legal Social Ethical Labor |
| Smith, 1994, p. 18 | Market-based production of goods and services, whether legal or illegal, that escapes detection in the official estimates of GDP. | 64 | Economic Legal Social Political Ethical |
Schneider, 2014, p. 228 | All market-based legal production of goods and services that are deliberately concealed from public authorities. | 13 | Economic Legal Ethical |
Bruton et al., 2012, p. 1 | It is the final frontier of the management domain. | 3 | Economic Ethical |
| Schneider, 2005 | Expected to influence the tax system and its structure, the efficiency of resource allocation between sectors, and the official economy in a dynamic sense. People engage in shadow economic activity for a variety of reasons, among the most important of which are government actions, most notably taxation and regulation. | 60 | Economic Legal Ethical Labor |
| Igudia et al., 2016, p. 3 | Consisting of three elements: informal employment (i.e., those doing informal types of job, regardless of the location of enterprise or operation); employment in the informal economy (i.e., those working in informal sector enterprises, regardless of the type of job done); and all legal activities that contribute to GDP but which do not figure in official statistics, for various reasons. | 17 | Economic Legal Social Political Labor |
| Henry, 1978 | An offshoot of capitalism | 101 | Economic Legal Political Ethical |
| Williams, 2013, p. 263 | A result of the structured development within the capitalist mode of production, the ‘deregulated global economy’, and under-regulation economies. |
79 | Economic Legal Political Ethical |