5. The creation of single markets in the EU and North America means that many markets that were formerly protected from foreign competition are now more open. This creates major investment and export opportunities for firms within and outside these regions. The free movement of goods across borders, the harmonization of product standards, and the simplification of tax regimes make it possible for firms based in a free trade area to realize potentially enormous cost economies by centralizing production in those locations within the area where the mix of factor costs and skills is optimal. Lowering barriers to trade and investment among countries within a trade group will probably be followed by increased price competition.