The U.S. economy maintains its powerhouse status through a combination of characteristics. The country has access to abundant natural resources and a sophisticated physical infrastructure. It also has a large, well-educated and productive workforce. Moreover, the physical and human capital is fully leveraged in a free-market and business-oriented environment. The government and the people of the United States both contribute to this unique economic environment. The government provides political stability, a functional legal system, and a regulatory structure that allow the economy to flourish. The general population, including a diversity of immigrants, brings a solid work ethic, as well as a sense of entrepreneurship and risk taking to the mix. Economic growth in the United States is constantly being driven forward by ongoing innovation, research and development as well as capital investment.