Interior of a large sanitary sewer viewed from an access manhole. In the developed world, sewers are pipes from buildings to one or more levels of larger underground trunk mains, which transport the sewage to sewage treatment facilities.
Free trade is a policy followed by some international markets in which countries' governments do not restrict imports from, or exports to, other countries. Free trade is exemplified by the European Economic Area and the North American Free Trade Agreement, which have established open markets. Most nations are today members of the World Trade Organization (WTO) multilateral trade agreements.
InvestorWords.com - Online Investing Glossary. An agreement between states, regions, or countries, to reduce barriers to trade between the participating regions. The most well known trade bloc is NAFTA, between the United States, Canada, and Mexico. Some opponents of trade blocs believe that such agreements are detrimental to global free trade. â The neighboring countries had a definitive trade bloc well established to keep commerce flowing across the narrow sea to everyone.