To prevent such a drain, a weak country thinking of leaving the euro would have to impose caps on bank withdrawals, other forms of capital controls, and perhaps even restrictions on foreign travel.

In the studying process, this thesis not only refers to domestic brain drain theory and research results, but also learns from the foreign policy and framework of brain drain.

On the other hand foreign capital Mergers and Acquisitions domestic enterprise arouses some problem, especially monopoly problem of key enterprise and industry and drain of state-owned assets.