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Competition to enter the schools is fierce, sometimes even higher than with extra-curricular tutorial classes for high school students. In some universities, elderly people even queue overnight for a chance to register for a class.

Colin Donihue, an evolutionary biologist at the Brown University, said the research is the latest effort to borrow from the natural world to solve human problems.

Companies are sourcing from many other countries for many reasons, she said. Everyone has some sourcing in China; many companies have some sourcing in Vietnam. And Bangladesh, India and Indonesia are sources, as well as countries in the Western Hemisphere.

Companies in mining posted a profit growth of 4.7 percent in the five months, while those in the manufacturing industry saw a 4.1-percent decline in profits.

Concerns and challenges