Singapore’s economy has been ranked as the most open and most pro-business economy in the world. Top sectors driving Singapore’s economy include Information Technology, Pharmaceuticals, Biotechnology, Precision Engineering, Aerospace & Professional Services. A lot of multinational companies such as Twitter, Dyson, Tencent, LinkedIn & Facebook have established their regional headquarters and global RnD laboratories in Singapore. Singapore is a prominent business hub of Asia owing to its connectivity, robust economy and strong influence in the region. Singapore has also been ranked as the Asian city with highest quality of life by Mercer, world's leading human resource management consulting agency.