The level of productivity of society determines the organizational form of social basic economic units. Enterprise is the result of the development of social productive forces to a certain level, which is the product of commodity production and exchange of goods. The German car market sold 3,697,290 new vehicles in 2011, down 1.9% from 2010, according to data released by the federal motor vehicle transport authority and the German automobile manufacturers association. The passenger car sold 3,173,634 vehicles, down 2.8%. In the context of the European debt crisis and the overall shrinking of the European market, the German car market has performed more smoothly than many expected in 2014. Compared with other developed countries in Europe, car sales in Germany are trending lower In 1934, professor rei, of the center for fluid mechanics, used model cars to measure the aerodynamic drag of various bodies in wind tunnels With the expansion of the global economy, Mr Trump may hope that tax cuts and deregulation will spur enough growth and create enough jobs that he will boast about. A 2 per cent potential growth rate does not necessarily help his blue-collar base, but it could at least push the stock market to its highest ever level. Although, of course, including republican all mainstream economists agree that, regardless of his policies, potential growth rate will remain at about 2%, still trump will claim that the U.S. economy can grow at 4%.