Three countries—Barbados, Jamaica and Trinidad and Tobago—had originally set 5 January 2005 as the date of signing the agreement relating to the CARICOM single market and economy (CSME). The ceremony had then been rescheduled to coincide with 19 February 2005 inauguration of the new CARICOM-headquarters building in Georgetown, Guyana, but this was later postponed after a ruling by the London Privy council caused alarm to several Caribbean countries.
The prospect was that ten of the remaining twelve CARICOM countries would join the CSME by the end of 2005. The Bahamas and Haiti were not expected to be a part of the new economic arrangement at that time. The CARICOM Secretariat maintains frequent contact with another organisation named the Organisation of Eastern Caribbean States (OECS), which represents seven Full members and two Associate members of CARICOM in the Eastern Caribbean. Many of the OECS countries are seeking to maintain themselves as a micro-economic grouping within CARICOM.
The CARICOM Single Market and Economy treaty finally went into effect on 1 January 2006, with Barbados, Belize, Jamaica, Guyana, Suriname and Trinidad and Tobago as the first full members. On 3 July 2006, the total membership was brought up to twelve when Antigua and Barbuda, Dominica, Grenada, St. Kitts and Nevis, St. Lucia, and St. Vincent and the Grenadines became full members. The British overseas territory of Montserrat is seeking permission from the United Kingdom to become a part of the single market; Haiti will not join the market initially because of its difficult internal political situation; and the Bahamas will not join because of local opposition to a provision that allows skilled workers to move more easily among nations.