The 10 leaders in the Association of Southeast Asian Nations will sign a declaration on Sunday establishing the ASEAN Economic Community, originally envisioned in 2002.
"The coming into being of the ASEAN community marks a new beginning for more than 630 million people, the birth of an integrated region- an entity that is a global economic force," Malaysian Prime Minister Najib Razak told business leaders.
Although ASEAN has helped greatly increase the region's economic, cultural and political cooperation, there is a long way to go before the AEC becomes fully functional after becoming a legal entity on December 31.
ASEAN countries have torn down tariff barriers and have removed some visa restrictions, allowing people to work in other countries provided the jobs are in eight sectors, including medical, engineering and tourism.
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AEC "is not the finished article. Neither is it officially claimed to be. There is much work to be done," said Mohamad Munir Abdul Majid, chairman of a council that advises ASEAN on business matters.
"There is a disparity between what is officially recorded as having been achieved ... And what the private sector reports as their experience."
There are also other hurdles, such as corruption, uneven infrastructure and unequal costs of transportation and shipping. A wide economic gulf divides Southeast Asia's rich and middle income economies - Malaysia, Indonesia, Singapore, Brunei, Thailand and the Philippines - and its four less developed members, Vietnam and Laos, Myanmar and Cambodia.
The AEC was envisaged in 2002 -- and a blueprint created in 2007 -- to face competition from China and India for market share and investments. While China's economic growth is expected to slow to an average of 6 per cent annually over the next five years, India's expansion is likely to pick up to 7.3 per cent in the same period, according to the OECD.