The UN Development Programme's Human Development Report 2009, released in
'The report's overriding message is that migration - both across and within borders - has the potential to improve human welfare, if we get it right,' Clark said.
Thailand, home to more than 3 million migrant workers and a notorious hub for human trafficking, was deemed an appropriate launch pad for the report.
Clark commended Thailand's policy of providing 'registered migrants' with health care services, including anti-retroviral drugs for HIV/AIDS, and even education for their children, but the report pointed out that legal migrants must pay hefty 'transaction' fees, prompting many to choose illegal channels instead.
Thai authorities last December came under heavy criticism for pushing back to sea hundreds of Rohingya migrant workers from Myanmar, and the government is faulted for not registering all migrants, exposing them to abuse.
'I think the situation in Thailand at the moment does illustrate some of the challenges as well as the importance of some of the points we're making, especially in terms of simplification of the procedures and reducing the costs (of migration) as much as possible,' Jeni Klugman, the report's main author, said.
The report - titled Overcoming barriers: Human mobility and development - broadly recommends that governments around the world facilitate labour migration, which generates about 300 billion dollars in remittances annually and provides an 'aggregate benefit' economically for both supply and destination countries.
The study also pops some common myths about migration.
For instance, of the world's 1 billion migrants, it notes that 740 million are internal migrants, who move within their own countries, and only 70 million are migrating from developing countries to developed ones.
The majority of international migrants, or about 200 million people, migrate from developing countries to other developing countries.
And it is often the poorest migrants, those employed at unskilled jobs, who are the most abused by existing migration practices and immigration systems.
'Under agreements between Thailand, Cambodia and the Lao People's Democratic Republic, recruitment fees are equivalent to 4-5 months' salary and 15 per cent of the wages are withheld pending the migrants' return home,' the report said.
'In contrast, smugglers in these corridors reportedly charge the equivalent of one month's salary,' it added, noting that as a result only 26 per cent of migrant workers in Thailand were registered.
The exploitation of workers generally starts at home.
The UNDP report noted that in the Democratic Republic of Congo, a passport can cost up to 500 dollars in bribes.
Besides calling for a lowering of barriers to migration, especially for unskilled labour, the report also calls for the provision of basic rights and services, such as education and health care, for immigrants.
It estimated that one-fifth of the economic benefits from migration accrue in the destination countries, 'partly through taxes, which people pay, partly in terms of productivity and partly through innovations,' Klugman said.
For source countries, the most obvious benefit is in terms of remittances sent home, however remittances have been hit this year by the global recession.
'Remittances to developing countries are expected to fall from 308 billion dollars in 2008 to 293 billion in 2009,' the report said.
In 2007, the volume of official remittance amounted to four times the total official development aid.
Generally speaking, populations are more open to migration when economies are good and jobs plentiful.
But the UNDP urged governments to think about the future in remodelling their migration practices.
'Following recovery from the global recession, demand for migrant workers will return, therefore it is short-sighted to negate benefits which migrants bring,' Klugman said.
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