The 150 million people who live outside the country of their birth makeup less than 2.5 pe

rcent of world population, but they have an importance far beyond their numbers. Some international migrants are refugees or students, but those with the most impact are economic migrants, drawn to places such as Los Angeles, where the wages may be three times greater than those in Bombay. These migrants tend to be young and willing to work for low wages. Though traditionally unskilled, a growing number are highly educated.

Immigration is now the major contributor to demographic change in many developed countries. In the U.S., according to the latest U.S. Census Bureau projection, the population will grow by 129 million in the period from 2000 to 2050, but if immigration stops it would go up by just 54 million. Western Europe's population is 42 percent greater than that of the U.S., but its projected immigration is only about half that of the U.S.; as a consequence, the region expected to lose 28 million people over the next 50 years. Japan, which has close to zero net migration, is projected to lose 26 million by 2050. (Deaths will start outrunning births in west Europe and Japan around the middle of this decade.)

During file past six years, the U.S. received 7 percent of the world's international migrants, compared with 9 percent by Germany, the second most popular destination. One fourth of all migrants to the U.S. went to California; favorite cities, in order of the number of foreign-born, are Los Angeles, New York City, San Francisco, Miami and Chicago.

International migrants primarily come from developing countries, with China at 14 percent and Mexico at 8 percent being the largest sources. A few developing countries, Afghanistan, Bosnia, Liberia and Rwanda—have had significant influxes in recent years, but these reflect mainly the movement of refugees. Most developing countries had negative net migration.

In the past few years, every European country with considerable immigration has had a reaction against foreign workers, according to social scientist Christopher Jencks of Harvard University. Some Asian countries hit hard by recession in the late 1990s tried to repatriate migrant workers. Thus far the U.S. shows no signs of reinstituting the extremely restrictive immigration laws of the past, a major reason being the dependence of many industries on a supply of foreign labor. Indeed, the AFL-CIO, once an opponent of high immigration quotas, has reversed position and is now attempting to organize immigrant. This change in attitude, among other reasons, leads Jencks to conclude that a substantial reversal of the current liberal policies is unlikely.

Which of the following statements does NOT exactly describe the economic migrants？

A．They tend to be young,

B．Many of them are highly educated.

C．They are willing to work for low wages.

D．They constitute 2.5% of the world population.