Title: Economy of the United States
Content:  waterways have helped shape the country's economic growth over the years and helped bind America's fifty individual states together in a single economic unit. The number of workers and, more importantly, their productivity help determine the health of the U.S. economy. Consumer spending in the U.S. rose to about 62% of GDP in 1960, where it stayed until about 1981, and has since risen to 71% in 2013. Throughout its history, the United States has experienced steady growth in the labor force, a phenomenon that is both cause and effect of almost constant economic expansion. Until shortly after World War I, most workers were immigrants from Europe, their immediate descendants, or African Americans who were mostly slaves taken from Africa, or their descendants.
Title: Transformation in economics
Content:  striving for better standards of living – they cannot be stopped at will. In the US there are only three subsectors where net jobs are still being created: education, health care, and government. The first two are subject to market forces and will undergo accelerating productivity growth rates and declining employment levels in the near future. The third one, GWU, is sheltered from competition, cannot expand its share substantially because it depends on taxation from other sectors; its employment growth is unsustainable. Slowly, the US economy has shifted towards sectors with lower added value, leading to lower real incomes and increasing indebtness. This 
Title: The Great Stagnation
Content:  The main thesis is that economic growth has slowed in the United States and in other advanced economies, as a result of falling rates of innovation. In Chapter 1, Cowen describes the three major forms of "low-hanging fruit": the ease of cultivating free and unused land, rapid invention from 1880 to 1940 which capitalized on the scientific breakthroughs of the 18th and 19th centuries and the large returns from sending intelligent but uneducated children to school and university. There are potentially two further minor forms: cheap fossil fuels and the strength of the American constitution. Cowen concludes, "You could say, 'The modern United States was built at five 
Title: Secondary sector of the economy
Content:  products tend to generate higher marginal GDP growth, which supports higher incomes and therefore marginal tax revenue needed to fund such government expenditures as health care and infrastructure. Among developed countries, it is an important source of well-paying jobs for the middle class (e.g., engineering) to facilitate greater social mobility for successive generations on the economy. Currently, an estimated 20% of the labor force in the United States is involved in the secondary industry. The secondary sector depends on the primary sector for the raw materials necessary for production. Countries that primarily produce agricultural and other raw materials (i.e., primary sector) tend to grow slowly and remain either under-developed or developing economies. The value added through the transformation of raw materials into finished goods reliably generates greater profitability, which underlies the faster growth of developed economies.
Title: Economy of the United States
Content:  In 180 years, the U.S. grew to a huge, integrated, industrialized economy that made up around one-fifth of the world economy. As a result, the U.S. GDP per capita converged on and eventually surpassed that of the British Empire, as well as other countries that it previously trailed economically. The economy maintained high wages, attracting immigrants by the millions from all over the world. In the early 1800s, the United States was largely agricultural with more than 80 percent of the population in farming. Most of the manufacturing centered on the first stages of transformation of raw materials with lumber and sawmills, textiles, and boots and shoes leading the way. The rich resource endowments contributed to the rapid economic expansion during the nineteenth 
Title: Economic growth
Content:  highway infrastructures also contributed to post World War II growth, as did capital investments in manufacturing and chemical industries. The post World War II economy also benefited from the discovery of vast amounts of oil around the world, particularly in the Middle East. By John W. Kendrick's estimate, three-quarters of increase in U.S. per capita GDP from 1889 to 1957 was due to increased productivity. Economic growth in the United States slowed down after 1973. In contrast growth in Asia has been strong since then, starting with Japan and spreading to Four Asian Tigers, China, Southeast Asia, the Indian subcontinent and 
Title: Economic growth
Content:  Policymakers and scholars frequently emphasize the importance of entrepreneurship for economic growth. However, surprisingly few research empirically examine and quantify entrepreneurship's impact on growth. This is due to endogeneity—forces that drive economic growth also drive entrepreneurship. In other words, the empirical analysis of the impact of entrepreneurship on growth is difficult because of the joint determination of entrepreneurship and economic growth. A few papers use quasi-experimental designs, and have found that entrepreneurship and the density of small businesses indeed have a causal impact on regional growth. Another major cause of economic growth is the introduction of new products and services and the improvement of existing products. New products create demand, which is necessary to offset the decline in employment that occurs through labor-saving technology (and to a lesser extent employment declines due to savings in energy and materials). In the U.S. by 2013 about 60% of consumer spending was for goods and services that did not exist in 1869. Also, the creation of new services has been more important than invention of new goods.
Title: Economic growth
Content:  Economic growth in the U.S. and other developed countries went through phases that affected growth through changes in the labor force participation rate and the relative sizes of economic sectors. The transition from an agricultural economy to manufacturing increased the size of the sector with high output per hour (the high-productivity manufacturing sector), while reducing the size of the sector with lower output per hour (the lower productivity agricultural sector). Eventually high productivity growth in manufacturing reduced the sector size, as prices fell and employment shrank relative to other sectors. The service and government sectors, where output per hour and productivity growth is low, saw increases in their shares of the economy and employment during the 1990s. The public sector has since contracted, while the service economy expanded in the 2000s. The structural change could also be viewed from another angle. It is possible to divide real economic growth into two components: an indicator of extensive economic growth—the ‘quantitative’ GDP—and an indicator of the improvement of the quality of goods and services—the ‘qualitative’ GDP.
Title: Economy of the United States
Content:  industry and academia grew rapidly and by the late 1930s exceeded the size of that taking place in Britain (although the quality of U.S. research was not yet on par with British and German research at the time). After World War II, federal spending on defense R&D and antitrust policy played a significant role in U.S. innovation. The United States is rich in mineral resources and fertile farm soil, and it is fortunate to have a moderate climate. It also has extensive coastlines on both the Atlantic and Pacific Oceans, as well as on the Gulf of Mexico. Rivers flow from far within the continent and the Great Lakes (the five large inland lakes along the Canadian border) provide additional shipping access. These 
Title: Economy of the United States
Content:  the result of multiple factors including increased productivity, trade, and secular economic trends. In addition, growth in telecommunications, pharmaceuticals, aircraft, heavy machinery and other industries along with declines in low end, low skill industries such as clothing, toys, and other simple manufacturing have resulted in some U.S. jobs being more highly skilled and better paying. There has been much debate within the United States on whether the decline in manufacturing jobs are related to American unions, lower foreign wages, or both. Products include wheat, corn, other grains, fruits, vegetables, cotton; beef, pork, poultry, dairy products, forest products, and fish.

Question: what are the main sources of economic growth in the us currently?
Answer: pharmaceuticals.
heavy machinery.
telecommunications.
aircraft.