Which of the Following Is NOT One of the Four

Multiple Choice

Which of the following is NOT one of the four principal functions of global cities,as outlined by Saskia Sassen?

A) to serve as "command posts" in the organization of the world economy
B) to serve as the principal markets for global businesses
C) to serve as important sites of innovation and new product development
D) to serve as multicultural centers of music,art,literature,and language