The city remains as the economic and business hub in the country. Kuala Lumpur is a centre for finance, insurance, real estate, media and the arts of Malaysia. Kuala Lumpur is rated as an alpha world city, and is the only global city in Malaysia, according to the Globalization and World Cities Study Group and Network (GaWC). The infrastructure development in the surrounding areas such as the Kuala Lumpur International Airport at Sepang, the creation of the Multimedia Super Corridor and the expansion of Port Klang further reinforce the economic significance of the city.