Japan's is one of the most powerful economies in the world, despite a lack of national resources that makes it highly dependent on imports of raw materials and fuel. A strong work ethic, a close relationship between government and various industries, and access to sophisticated technology have made Japan a main economic power. Industrial products such as cars, electronic devices and computers are the biggest export items; however, services comprise about three quarters of its GDP. The United States and China are the largest trading partners; other notable partners are Taiwan, Hong Kong, South Korea, and Singapore.