refers to entities qualified to sell tours, cruises, transportation, hotel accommodations, meals, transfers, sightseeing and all other elements of travel to visitors in a certain geographic area at a certain moment in time and within certain conditions. The agency acts as a broker, bringing the buyer and seller together. They do not substitute the service-providing unit, but play the role of providing information and access to the visitor and are the middlemen in the purchase of certain services. Reference: Tourism Satellite Account: Methodological Reference, 2000 (WTO) paragraph 3.37, page 40; International Tourism: Global Perspective (WTO) 1st edition: October 1997, page 389; and Principles of Tourism, Part I – 1999, Zenaida L. Cruz, Ph.D.