None of the countries has, so far, adopted a specific policy to attract highly skilled migrants.
For example, Tier 1 visas were supposed to be reserved for only the highest skilled migrants.
To complicate matters, highly skilled migrants contribute much more to tax and social-security systems than do less skilled ones.
Singapore was chosen as a country which has become increasingly attractive to highly skilled migrants, according to the OECD reports.
The LSE study concluded that immigration had probably increased productivity because skilled migrants had relieved bottlenecks in the labour market.
Only South Africa, Russia and the Special Administrative Regions (SAR) of China seem to have specific policies for highly skilled migrants.
In Germany, the employers' union has said that 1.5m more skilled migrants could be needed for the economy to be competitive.
In an economic downturn, low-skilled migrants may be the first to lose their jobs, but the high-skilled ones should survive, she says.
Rich countries have taken in more highly skilled migrants than ever before.
If they are not English speakers or skilled migrants, they must pass a course in English for speakers of other languages (ESOL) which contains citizenship materials.
Indians have been granted over three times as many visas for highly skilled migrants as any other nationality since the Home Office invented the category in 2002.
Behind the decline is a rush by property developers to build apartments for thousands of skilled migrants expected to seek work in the Pacific nation's booming mining industry.
Legislators from both parties have at various times advanced proposals that would smooth the way for skilled migrants, but they have usually foundered on the more intractable problem of dealing with illegal immigration.
Prime Minister Julia Gillard has pledged to clamp down on the "457" temporary work visas granted to skilled migrants eager to share in the country's mining boom that has helped power more than two decades of annual growth.
Prime Minister Julia Gillard has pledged to clamp down on 457s, the temporary work visas granted to skilled migrants eager to share the spoils of the country's mining boom, which has helped power more than two decades of uninterrupted annual growth.
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The minister is adamant that immigrant workers will not be exploited by being forced into low-skilled jobs, but migrants and the people who work with them on the ground have different worries.
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The number of visas issued to skilled non-EU migrants without job offers - known as tier 1 - would be cut by 13, 000 to 1, 000, and the corresponding number of visas issued to those with job offers - known as tier 2 - would increase by 7, 000 to 20, 700, Mrs May explained.
The low-skilled jobs also serve China well as Chinese rural migrants have opportunities to move up in life and gain some skills.
Various surveys of employers come to the predictable conclusion that migrants are better employees: they are more highly skilled, work harder and are prepared to do jobs that locals disdain.
And a Home Office analysis of a sample of migrants eligible for settlement in 2011 shows that under current rules those in less-skilled and worse-paid jobs (nurses, care workers, cooks) were more likely to settle at the first opportunity than those in better-paid or graduate-level jobs.
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Finally, conservatives should consider comprehensive immigration reform that would allow skilled and unskilled workers to seek their American dream while granting parole, not amnesty, to those hard-working migrants now here illegally.
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