The discussion so far, points out that, the degree to which a nation is likely to achieve international success in a certain industry is a function of the combined impact of factor endowments, demand conditions, related and supporting industries, and domestic rivalry. It is very obvious that these determinants are interrelated. Each is influenced by the others and in turn, influences the others. The presence of all these four components is usually required for this diamond to boost competitive performance although there are exceptions. Porter also points out that government can influence each of the four components of the diamond either positively or negatively. Factor endowments can be affected by subsidies, policies toward capital markets, policies toward education and others. Domestic demand can also be shaped through local product standards or regulations that mandate buyer needs. Government policy can also influence supporting and related industries through regulation and influence firm rivalry through such devices as capital market regulation, tax policy and antitrust laws. Countries should therefore be exporting products from those industries where all four components of the diamond are favourable, than importing in those areas where the components are not favourable in order to achieve competitive advantage.