essential oils to prevent lice ^ h h, however, interest rates are still significantly lower than in November 2015, when an average of 2.62 PC. The largest increase in the number of global blockchain participants has been so far The principle of rational investment: investment in securities investment in analysis and comparison. In the 18th century, the western countries successively carried out the industrial revolution, the universal adoption of large machinery, laid the foundation for the establishment of factory system. In 1771, British man Richard arkwright1732-1792 founded the first cotton-yarn factory in the city of kron. In the 1930s and 1940s, the factory system was established in Britain, Germany and other countries. The main sex of factory system is: to carry out large-scale intensive labor; Using big machine to improve efficiency production; Implement the employment system; The division of labor is deepening and production is socialized. The establishment of factory system marks the real birth of enterprises.