The Stock Exchange of Thailand (SET) is on Ratchadaphisek Road in inner Bangkok. The SET, together with the Market for Alternative Investment (MAI) has 648 listed companies as of the end of 2011, with a combined market capitalization of 8.485 trillion baht ($267.64 billion). Due to the large amount of foreign representation, Thailand has for several years been a mainstay of the Southeast Asian economy and a centre of Asian business. The Globalization and World Cities Research Network ranks Bangkok as an "Alpha -" world city, and it is ranked 59th in Z/Yen's ''Global Financial Centres Index 11''.