Explain why business services are disproportionately concentrated in global cities

The main reason for business services are disproportionately focused in global cities is because of the large ammount of headquarters for multinational companies. Another reason is that there is a large marketing and advertisement that are concentrated in major cities. A third factor is that stocks are brought and sold mostly in those cities. That is a problem cause many of those multinational companies are not interested in other types of cities to run their business.