Question

Why does unions have such strong bargaining power?
Writeacher
http://www.google.com/search?q=unions+bargaining+power&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA_en
sandra
describe the changing role of Human Resource (HR) management in response to trends in globalization, technology, diversity, e-business, and ethics.