The island has a unique social and economic structure in which all resident families farm and all land is communally owned. Outsiders are prohibited from buying land or settling on Tristan. Besides subsistence agriculture, major industries are commercial fishing and government. Major export industries are the Tristan rock lobster ("Jasus") fishery, the sale of the island's postage stamps and coins, and limited tourism. Like most British Overseas Territories, it was never a part of the European Union, but was a member of the EU's Overseas Countries and Territories Association.