The Johor-Singapore Special Economic Zone will sit on an area four times the size of Singapore, with nine zones covering everything from manufacturing to financial services. What are the opportunities and challenges of this ambitious agreement? Steven Chia and Crispina Robert speak to Thilan Wickramasinghe, head of research in Singapore and regional head of financials at Maybank Investment Banking Group and Serina Rahman, lecturer at the department of Southeast Asian Studies at the National University of Singapore.