Trade and professional associations traditionally have established national offices in New York City or Chicago. Several studies (Adler, 1972; Bower, 1979; Clarke, 1967; "Why Associations Move," 1972) suggest that the many mass media outlets in New York make that city a favorite location of associations that attempt to gain media exposure for their members, and that Chicago, because of its central location, is valued by associations that wish to maintain contact with members who live in many different areas of the United States.