When people cross national borders during their migration, they are called migrants or immigrants (from Latin: migrare, wanderer) from the perspective of the country which they enter. From the perspective of the country which they leave, they are called emigrant or outmigrant.Sociology designates immigration usually as migration (as well as emigration accordingly outward migration).
The global population of immigrants has grown since 1990 but has remained around 3% of the world's population.
As of 2015[update], the number of international migrants has reached 244 million worldwide, which reflects a 41% increase since 2000. One third of the world's international migrants are living in just 20 countries. The largest number of international migrants live in the United States, with 19% of the world's total. Germany and Russia host 12 million migrants each, taking the second and third place in countries with the most migrants worldwide. Saudi Arabia hosts 10 million migrants, followed by the United Kingdom (9 million) and the United Arab Emirates (8 million).
Between 2000 and 2015, Asia added more international migrants than any other major area in the world, gaining 26 million. Europe added the second largest with about 20 million. In most parts of the world, migration occurs between countries that are located within the same major area.
In 2015, the number of international migrants below the age of 20 reached 37 million, while 177 million are between the ages of 20 and 64. International migrants living in Africa were the youngest, with a median age of 29, followed by Asia (35 years), and Latin America/Caribbean (36 years), while migrants were older in Northern America (42 years), Europe (43 years), and Oceania (44 years).
Nearly half (43%) of all international migrants originate in Asia, and Europe was the birthplace of the second largest number of migrants (25%), followed by Latin America (15%). India has the largest diaspora in the world (16 million people), followed by Mexico (12 million) and Russia (11 million).
A 2012 survey by Gallup found that given the opportunity, 640 million adults would migrate to another country, with 23% of these would-be immigrant choosing the United States as their desired future residence, while 7% of respondents, representing 45 million people, would choose the United Kingdom. The other top desired destination countries (those where an estimated 69 million or more adults would like to go) were Canada, France, Saudi Arabia, Australia, Germany and Spain.
London has become multiethnic as a result of immigration. In London in 2008, Black British and British Asian children outnumbered white British children by about 3 to 2 in government-run schools.
One theory of immigration distinguishes between push and pull factors.
Push factors refer primarily to the motive for immigration from the country of origin. In the case of economic migration (usually labor migration), differentials in wage rates are common. If the value of wages in the new country surpasses the value of wages in one's native country, he or she may choose to migrate, as long as the costs are not too high. Particularly in the 19th century, economic expansion of the US increased immigrant flow, and nearly 15% of the population was foreign born, thus making up a significant amount of the labor force.
As transportation technology improved, travel time and costs decreased dramatically between the 18th and early 20th century. Travel across the Atlantic used to take up to 5 weeks in the 18th century, but around the time of the 20th century it took a mere 8 days. When the opportunity cost is lower, the immigration rates tend to be higher. Escape from poverty (personal or for relatives staying behind) is a traditional push factor, and the availability of jobs is the related pull factor. Natural disasters can amplify poverty-driven migration flows. Research shows that for middle-income countries, higher temperatures increase emigration rates to urban areas and to other countries. For low-income countries, higher temperatures reduce emigration.
Some migration is for personal reasons, based on a relationship (e.g. to be with family or a partner), such as in family reunification or transnational marriage (especially in the instance of a gender imbalance). Recent research has found gender, age, and cross-cultural differences in the ownership of the idea to immigrate. In a few cases, an individual may wish to immigrate to a new country in a form of transferred patriotism. Evasion of criminal justice (e.g., avoiding arrest) is a personal motivation. This type of emigration and immigration is not normally legal, if a crime is internationally recognized, although criminals may disguise their identities or find other loopholes to evade detection. For example, there have been reports of war criminals disguising themselves as victims of war or conflict and then pursuing asylum in a different country.
Barriers to immigration come not only in legal form or political form; natural and social barriers to immigration can also be very powerful. Immigrants when leaving their country also leave everything familiar: their family, friends, support network, and culture. They also need to liquidate their assets, and they incur the expense of moving. When they arrive in a new country, this is often with many uncertainties including finding work, where to live, new laws, new cultural norms, language or accent issues, possible racism, and other exclusionary behavior towards them and their family.
The Iron Curtain in Europe was designed as a means of preventing emigration. "It is one of the ironies of post-war European history that, once the freedom to travel for Europeans living under communist regimes, which had long been demanded by the West, was finally granted in 1989/90, travel was very soon afterwards made much more difficult by the West itself, and new barriers were erected to replace the Iron Curtain." —Anita Böcker
Studies have suggested that some special interest groupslobby for less immigration for their own group and more immigration for other groups since they see effects of immigration, such as increased labor competition, as detrimental when affecting their own group but beneficial when impacting other groups. A 2010 European study suggested that "employers are more likely to be pro-immigration than employees, provided that immigrants are thought to compete with employees who are already in the country. Or else, when immigrants are thought to compete with employers rather than employees, employers are more likely to be anti-immigration than employees." A 2011 study examining the voting of US representatives on migration policy suggests that "representatives from more skilled labor abundant districts are more likely to support an open immigration policy towards the unskilled, whereas the opposite is true for representatives from more unskilled labor abundant districts."
Another contributing factor may be lobbying by earlier immigrants. The Chairman for the US Irish Lobby for Immigration Reform—which lobby for more permissive rules for immigrants, as well as special arrangements just for Irish people—has stated that "the Irish Lobby will push for any special arrangement it can get—'as will every other ethnic group in the country.'"
The term economic migrant refers to someone who has travelled from one region to another region for the purposes of seeking employment and an improvement in quality of life and access to resources. An economic migrant is distinct from someone who is a refugee fleeing persecution.
Many countries have immigration and visa restrictions that prohibit a person entering the country for the purposes of gaining work without a valid work visa. As a violation of a State's immigration laws a person who is declared to be an economic migrant can be refused entry into a country.
The process of allowing immigrants into a particular country is believed to have effects on wages and employment. In particular lower skilled workers are thought to be directly affected by economic migrants, but evidence suggests that this is due to adjustments within industries.
The World Bank estimates that remittances totaled $420 billion in 2009, of which $317 billion went to developing countries.
Some proponents of immigration argue that the freedom of movement both within and between countries is a basic human right, and that the restrictive immigration policies, typical of nation-states, violate this human right of freedom of movement. Such arguments are common among anti-state ideologies like anarchism and libertarianism. As philosopher and Open borders activist Jacob Appel has written, "Treating human beings differently, simply because they were born on the opposite side of a national boundary, is hard to justify under any mainstream philosophical, religious or ethical theory."
Where immigration is permitted, it is typically selective. As of 2003[update], family reunification accounted for approximately two-thirds of legal immigration to the US every year. Ethnic selection, such as the White Australia policy, has generally disappeared, but priority is usually given to the educated, skilled, and wealthy. Less privileged individuals, including the mass of poor people in low-income countries, cannot avail themselves of the legal and protected immigration opportunities offered by wealthy states. This inequality has also been criticized as conflicting with the principle of equal opportunities. The fact that the door is closed for the unskilled, while at the same time many developed countries have a huge demand for unskilled labor, is a major factor in illegal immigration. The contradictory nature of this policy—which specifically disadvantages the unskilled immigrants while exploiting their labor—has also been criticized on ethical grounds.
Immigration policies which selectively grant freedom of movement to targeted individuals are intended to produce a net economic gain for the host country. They can also mean net loss for a poor donor country through the loss of the educated minority—a "brain drain". This can exacerbate the global inequality in standards of living that provided the motivation for the individual to migrate in the first place. One example of competition for skilled labour is active recruitment of health workers from developing countries by developed countries. There may however also be a "brain gain" to emigration, as migration opportunities lead to greater investments in education in developing countries. Overall, research suggests that migration is beneficial both to the receiving and sending countries.
A survey of leading economists shows a consensus behind the view that high-skilled immigration makes the average American better off. A survey of the same economists also shows strong support behind the notion that low-skilled immigration makes the average American better off. According to David Card, Christian Dustmann, and Ian Preston, "most existing studies of the economic impacts of immigration suggest these impacts are small, and on average benefit the native population". In a survey of the existing literature, Örn B Bodvarsson and Hendrik Van den Berg write, "a comparison of the evidence from all the studies... makes it clear that, with very few exceptions, there is no strong statistical support for the view held by many members of the public, namely that immigration has an adverse effect on native-born workers in the destination country."
Whereas the impact on the average native tends to be small and positive, studies show more mixed results for low-skilled natives, but whether the effects are positive or negative, they tend to be small either way. Overall immigration has not had much effect on native wage inequality but low-skill immigration has been linked to greater income equality in the native population. Research also suggests that diversity has a net positive effect on productivity and economic prosperity. A 2011 literature review of the economic impacts of immigration found that the net fiscal impact of migrants varies across studies but that the most credible analyses typically find small and positive fiscal effects on average. According to the authors, "the net social impact of an immigrant over his or her lifetime depends substantially and in predictable ways on the immigrant's age at arrival, education, reason for migration, and similar". According to a 2007 literature review by the Congressional Budget Office, "Over the past two decades, most efforts to estimate the fiscal impact of immigration in the United States have concluded that, in aggregate and over the long term, tax revenues of all types generated by immigrants—both legal and unauthorized—exceed the cost of the services they use."
Studies of refugees' impact on native welfare are scant but the existing literature shows mixed results (negative, positive and no significant effects on native welfare). According to labor economist Giovanni Peri, the existing literature suggests that there are no economic reasons why the American labor market could not easily absorb 100,000 Syrian refugees in a year. Refugees integrate more slowly into host countries' labor markets than labor migrants, in part due to the loss and depreciation of human capital and credentials during the asylum procedure. Research on the economic effects of undocumented immigrants is even more scant but existing studies suggests that the effects are positive for the native population, and public coffers. A 2015 study shows that "increasing deportation rates and tightening border control weakens low-skilled labor markets, increasing unemployment of native low-skilled workers. Legalization, instead, decreases the unemployment rate of low-skilled natives and increases income per native."
Research suggests that migration is beneficial both to the receiving and sending countries. According to one study, welfare increases in both types of countries: "welfare impact of observed levels of migration is substantial, at about 5% to 10% for the main receiving countries and about 10% in countries with large incoming remittances". According to Branko Milanovic, country of residency is by far the most important determinant of global income inequality, which suggests that the reduction in labor barriers would significantly reduce global income inequality. A study of equivalent workers in the United States and 42 developing countries found that "median wage gap for a male, unskilled (9 years of schooling), 35 year-old, urban formal sector worker born and educated in a developing country is P$15,400 per year at purchasing power parity". A 2014 survey of the existing literature on emigration finds that a 10 percent emigrant supply shock would increase wages in the sending country by 2-5.5%. According to economists Michael Clemens and Lant Pratchett, "permitting people to move from low-productivity places to high-productivity places appears to be by far the most efficient generalized policy tool, at the margin, for poverty reduction". A successful two-year in situ anti-poverty program, for instance, helps poor people make in a year what is the equivalent of working one day in the developed world. Research on a migration lottery that allowed that allowed Tongans to move to New Zealand found that the lottery winners saw a 263% increase in income from migrating (after only one year in New Zealand) relative to the unsuccessful lottery entrants. A longer-term study on the Tongan lottery winners finds that they "continue to earn almost 300 percent more than non-migrants, have better mental health, live in households with more than 250 percent higher expenditure, own more vehicles, and have more durable assets". A conservative estimate of their lifetime gain to migration is NZ$315,000 in net present value terms (approximately US$237,000). A slight reduction in the barriers to labor mobility between the developing and developed world would do more to reduce poverty in the developing world than any remaining trade liberalization.
Studies show that the elimination of barriers to migration would have profound effects on world GDP, with estimates of gains ranging between 67–147.3%. Research also finds that migration leads to greater trade in goods and services. Using 130 years of data on historical migrations to the United States, one study finds "that a doubling of the number of residents with ancestry from a given foreign country relative to the mean increases by 4.2 percentage points the probability that at least one local firm invests in that country, and increases by 31% the number of employees at domestic recipients of FDI from that country. The size of these effects increases with the ethnic diversity of the local population, the geographic distance to the origin country, and the ethno-linguistic fractionalization of the origin country."
According to one survey of the existing economic literature, "much of the existing research points towards positive net contributions by immigrant entrepreneurs." Mass migration can also boost innovation and growth, as shown by the Huguenot Diaspora in Prussia, German Jewish Émigrés in the US, the Mariel boatlift and west-east migration in the wake of German reunification. Immigrants have been linked to greater invention and innovation in the US. Research also shows that labor migration increases human capital. Foreign doctoral students are a major source of innovation in the American economy.
One study finds "some evidence that larger immigrant population shares (or inflows) yield positive impacts on institutional quality. At a minimum, our results indicate that no negative impact on economic freedom is associated with more immigration."
Research indicates that immigrants are more likely to work in risky jobs than U.S.-born workers, partly due to differences in average characteristics, such as immigrants' lower English language ability and educational attainment. Further, some studies indicate that higher ethnic concentration in metropolitan areas is positively related to the probability of self-employment of immigrants.
Some research has found that as immigration and ethnic heterogeneity increase, government funding of welfare and public support for welfare decrease.Ethnic nepotism may be an explanation for this phenomenon. Other possible explanations include theories regarding in-group and out-group effects and reciprocal altruism.
Research however also challenges the notion that ethnic heterogeneity reduces public goods provision. Studies that find a negative relationship between ethnic diversity and public goods provision often fail to take into account that strong states were better at assimilating minorities, thus decreasing diversity in the long run. Ethnically diverse states today consequently tend to be weaker states. Because most of the evidence on fractionalization comes from sub-Saharan Africa and the United States, the generalizability of the findings is questionable. Much of the fractionalization in the US comes from African Americans, whose ancestors were involuntary immigrants.
Research finds that Americans' attitudes towards immigration influences their attitudes towards welfare spending.
One study finds that non-native speakers of English in the UK have no causal impact on the performance of other pupils. The presence of immigrant children in classrooms has no significant impact on the test scores of Dutch children. An Austrian study finds no effect on grade repetition among native students exposed to migrant students. A North Carolina study found that the presence of Latin American children in schools had no significant negative effects on peers, but that students with limited English skills had slight negative effects on peers.
A 2015 report by the National Institute of Demographic Studies finds that an overwhelming majority of second-generation immigrants of all origins in France feel French, despite the persistent discrimination in education, housing and employment that many of the minorities face.
A 2016 paper challenges the view that cultural differences are necessarily an obstacle to long-run economic performance of migrants. It finds that "first generation migrants seem to be less likely to success the more culturally distant they are, but this effect vanishes as time spent in the USA increases."
Research shows that country of origin matters for speed and depth of immigrant assimilation but that there is considerable assimilation overall. Research finds that first generation immigrants from countries with less egalitarian gender cultures adopt gender values more similar to natives over time. According to one study, "this acculturation process is almost completed within one generational succession: The gender attitudes of second generation immigrants are difficult to distinguish from the attitudes of members of mainstream society. This holds also for children born to immigrants from very gender traditional cultures and for children born to less well integrated immigrant families." Similar results are found on a study of Turkish migrants to Western Europe. The assimilation on gender attitudes has been observed in education, as one study finds "that the female advantage in education observed among the majority population is usually present among second-generation immigrants."
First-generation immigrants tend to hold less accepting views of homosexual lifestyles but opposition weakens with longer stays. Second-generation immigrants are overall more accepting of homosexual lifestyles, but the acculturation effect is weaker for Muslims and to some extent, Eastern Orthodox migrants.
A study of Bangladeshi migrants in East London found they shifted towards the thinking styles of the wider non-migrant population in just a single generation.
A study on Germany found that foreign-born parents are more likely to integrate if their children are entitled to German citizenship at birth.Naturalization is associated with large and persistent wage gains for the naturalized citizens in most countries.
Measuring assimilation can be difficult due to "ethnic attrition", which refers to when ancestors of migrants cease to self-identify with the nationality or ethnicity of their ancestors. This means that successful cases of assimilation will be underestimated. Research shows that ethnic attrition is sizable in Hispanic and Asian immigrant groups in the United States. By taking account of ethnic attrition, the assimilation rate of Hispanics in the United States improves significantly.
Studies on programs that randomly allocate refugee immigrants across municipalities find that the assignment of neighborhood impacts immigrant crime propensity, education and earnings.
Research suggests that bilingual schooling reduces barriers between speakers from two different communities.
There is some research that suggests that immigration adversely affects social capital. One study, for instance, found that "larger increases in US states' Mexican population shares correspond to larger decreases in social capital over the period" 1986-2004.
Research suggests that immigration has positive effects on native workers' health. As immigration rises, native workers are pushed into less demanding jobs, which improves native workers' health outcomes.
Much of the empirical research on the causal relationship between immigration and crime has been limited due to weak instruments for determining causality. According to one economist writing in 2014, "while there have been many papers that document various correlations between immigrants and crime for a range of countries and time periods, most do not seriously address the issue of causality." The problem with causality primarily revolves around the location of immigrants being endogenous, which means that immigrants tend to disproportionally locate in deprived areas where crime is higher (because they cannot afford to stay in more expensive areas) or because they tend to locate in areas where there is a large population of residents of the same ethnic background. A burgeoning literature relying on strong instruments provides mixed findings. As one economist describes the existing literature in 2014, "most research for the US indicates that if any, this association is negative... while the results for Europe are mixed for property crime but no association is found for violent crime". Another economist writing in 2014, describes how "the evidence, based on empirical studies of many countries, indicates that there is no simple link between immigration and crime, but legalizing the status of immigrants has beneficial effects on crime rates."
The relationship between crime and the legal status of immigrants remains understudied but studies on amnesty programs in the United States and Italy suggest that legal status can largely explain the differences in crime between legal and illegal immigrants, most likely because legal status leads to greater job market opportunities for the immigrants. However, one study finds that the Immigration Reform and Control Act (IRCA) of 1986 led to an increase in crime among previously undocumented immigrants.
Research suggests that police practices, such as racial profiling, over-policing in areas populated by minorities and in-group bias may result in disproportionately high numbers of racial minorities among crime suspects in Sweden, Italy, and England and Wales. Research also suggests that there may be possible discrimination by the judicial system, which contributes to a higher number of convictions for racial minorities in Sweden, the Netherlands, Italy, Germany, Denmark and France.
Several meta-analyses find extensive evidence of ethnic and racial discrimination in hiring in the North-American and European labor markets. A 2016 meta-analysis of 738 correspondence tests in 43 separate studies conducted in OECD countries between 1990 and 2015 finds that there is extensive racial discrimination in hiring decisions in Europe and North-America. Equivalent minority candidates need to send around 50% more applications to be invited for an interview than majority candidates.
A 2014 meta-analysis found extensive evidence of racial and ethnic discrimination in the housing market of several European countries.
The United States
A 2014 meta-analysis of racial discrimination in product markets found extensive evidence of minority applicants being quoted higher prices for products. A 1995 study found that car dealers "quoted significantly lower prices to white males than to black or female test buyers using identical, scripted bargaining strategies." A 2013 study found that eBay sellers of iPods received 21 percent more offers if a white hand held the iPod in the photo than a black hand.
Criminal justice system
Research suggests that police practices, such as racial profiling, over-policing in areas populated by minorities and in-group bias may result in disproportionately high numbers of racial minorities among crime suspects. Research also suggests that there may be possible discrimination by the judicial system, which contributes to a higher number of convictions for racial minorities. A 2012 study found that "(i) juries formed from all-white jury pools convict black defendants significantly (16 percentage points) more often than white defendants, and (ii) this gap in conviction rates is entirely eliminated when the jury pool includes at least one black member." Research has found evidence of in-group bias, where "black (white) juveniles who are randomly assigned to black (white) judges are more likely to get incarcerated (as opposed to being placed on probation), and they receive longer sentences." In-group bias has also been observed when it comes to traffic citations, as black and white cops are more likely to cite out-groups.
A 2015 study using correspondence tests "found that when considering requests from prospective students seeking mentoring in the future, faculty were significantly more responsive to White males than to all other categories of students, collectively, particularly in higher-paying disciplines and private institutions." Through affirmative action, there is reason to believe that elite colleges favor minority applicants.
A 2014 meta-analysis found extensive evidence of racial discrimination in the American housing market. Minority applicants for housing needed to make many more enquiries to view properties. Geographical steering of African-Americans in US housing remained significant. A 2003 study finds "evidence that agents interpret an initial housing request as an indication of a customer's preferences, but also are more likely to withhold a house from all customers when it is in an integrated suburban neighborhood (redlining). Moreover, agents' marketing efforts increase with asking price for white, but not for black, customers; blacks are more likely than whites to see houses in suburban, integrated areas (steering); and the houses agents show are more likely to deviate from the initial request when the customer is black than when the customer is white. These three findings are consistent with the possibility that agents act upon the belief that some types of transactions are relatively unlikely for black customers (statistical discrimination)."
Several meta-analyses find extensive evidence of ethnic and racial discrimination in hiring in the American labor market. A 2016 meta-analysis of 738 correspondence tests - tests where identical CVs for stereotypically black and white names were sent to employers - in 43 separate studies conducted in OECD countries between 1990 and 2015 finds that there is extensive racial discrimination in hiring decisions in Europe and North-America. These correspondence tests showed that equivalent minority candidates need to send around 50% more applications to be invited for an interview than majority candidates. A study that examine the job applications of actual people provided with identical résumés and similar interview training showed that African-American applicants with no criminal record were offered jobs at a rate as low as white applicants who had criminal records.
Impact on the sending country
Remittances increase living standards in the country of origin. Remittances are a large share of the GDP of many developing countries. A study on remittances to Mexico found that remittances lead to a substantial increase in the availability of public services in Mexico, surpassing government spending in some localities.
Research finds that emigration and low migration barriers has net positive effects on human capital formation in the sending countries. This means that there is a "brain gain" instead of a "brain drain" to emigration.
One study finds that sending countries benefit indirectly in the long-run on the emigration of skilled workers because those skilled workers are able to innovate more in developed countries, which the sending countries are able to benefit on as a positive externality. Greater emigration of skilled workers consequently leads to greater economic growth and welfare improvements in the long-run. The negative effects of high-skill emigration remain largely unfounded. According to economist Michael Clemens, it has not been shown that restrictions on high-skill emigration reduce shortages in the countries of origin.
Research also suggests that emigration, remittances and return migration can have a positive impact on political institutions and democratization in the country of origin. Research also shows that remittances can lower the risk of civil war in the country of origin. Return migration from countries with liberal gender norms has been associated with the transfer of liberal gender norms to the home country.
Research suggests that emigration causes an increase in the wages of those who remain in the country of origin. A 2014 survey of the existing literature on emigration finds that a 10 percent emigrant supply shock would increase wages in the sending country by 2-5.5%. A study of emigration from Poland shows that it led to a slight increase in wages for high- and medium-skilled workers for remaining Poles. A 2013 study finds that emigration from Eastern Europe after the 2004 EU enlargement increased the wages of remaining young workers in the country of origin by 6%, while it had no effect on the wages of old workers. The wages of Lithuanian men increased as a result of post-EU enlargement emigration. Return migration is associated with greater household firm revenues.
Some research shows that the remittance effect is not strong enough to make the remaining natives in countries with high emigration flows better off.
It has been argued that high-skill emigration causes labor shortages in the country of origin. This remains unsupported in the academic literature though. According to economist Michael Clemens, it has not been shown that restrictions on high-skill emigration reduce shortages in the countries of origin.
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