The cities of Maputo, Beira, and Nampula are the main centers of commercial life, where it is estimated that 50% of all imported products are consumed. Maputo and Beira are trading centers and ports of entry. There is not a well-established distribution system for local or imported goods. Many local manufactures will sell or distribute their products on their own. Larger retailers will import high columns of goods and sell the excess to other smaller retailers. National distribution of regional products has been hindered by a poor transportation system. However, as of 2001, trading and distribution were still the primary business activities. A 17% value-added tax applies to most goods. Credit cards are not widely accepted.