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f talent and pay the damages or from other aspects of the pensation. Second, the face of barriers, from mobile professionals to obtain higher returns will actively enhance the quality of their own human capital, thereby improving the overall quality of human resources, to promote a lasting increase in ine. Third, enterprises erecting barriers personnel for the relative stability in raising output levels, to enhance corporate image, and so on the gains. Fourth, the barriers caused by the decline in the rate of brain drain will save replacement personnel, training and management process costs, This part of the costs can also have brought new ine. Costs and gains The outflow of personnel costs primarily include the following aspects : First, the outflow of personnel decisionmaking cost, which mainly includes : the cost of locating targets, specifically referring to a desired R1 found in time, energy and currency of inputs, As the process of searching for the time and energy on the input of the actual work of the above inputs and losses in leisure, consumption of opportunity cost。 Moreover, if the barriers are too high, Enterprises easily by outsiders is the lack of strength retain talent, thereby lowering enterprise right talents are attractive, Enterprises in other fields reputation will be damaged. Fourth, erecting barriers cost of the system, we refer to the erecting barriers and increase the overall management of the burden. barriers to the overall management of the burden。s cost and ine Brain drain caused by corporate cost: Although the brain drain of enterprises sometimes has some positive significance. If reasonable promote optimal allocation of talents, such as , as is usually the brain drain of enterprises are the disadvantages outweigh the benefits. Therefore this paper will only discuss the brain drain of the business losses. First, the brain drain caused personnel vacancies caused by loss of business efficiency and enterprise personnel replacement costs. Second, the 1668brain drain caused by enterprises in a mercial secret, the core technology and stable clients the loss. Third, the loss of talent to petitors, have the will to change enterprises in the petitive strength contrast, sometimes even between enterprises will change the relative position of the enterprise so as to cause enormous losses. Fourth, the brain drain may also trigger a chain reaction, such as additional personnel costs of the psychological affect his enthusiasm, and so on. Fifth, the brain drain could also give enterprises noise, reducing the results of the evaluation of enterprises, thus affecting corporate reputation stock prices. Enterprise erecting barriers to the main cost will include the following aspects : First, set up barriers to the direct costs, enterprise as a result of erecting barriers and the direct expenditures. These mainly include : erecting barriers to the initial costs, specifically refers to the enactment of the rules system, which have been paid manpower, material costs。 and the enterprises set up barriers and access to the proceeds of a reverse, set up barriers to enterprise ine lower erecting barriers of their higher probability because enterprises along with the proceeds of personnel costs (Mulct), overe barriers to lowcost talent outflow often leads to the increased probability. 2. Cost and ine analysis Based on preceding text economical rational supposition. We know the business and personnel decisions are weighed against the cost pared to the gains mad