Although an enterprise's internal trade fair eliminates or reduces some of the market transaction costs, it also brings with it the specific transaction costs of the enterprise. The main reason for this defect is also the incompleteness of information. Specifically, first, there are various contractual relationships among enterprises, including contractual relationship between enterprises and workers, contractual relationship between enterprises and managers, etc. The enterprise should supervise the work of the workers and products that it employs, as well as the managers and other personnel, and induces them to work hard for the enterprise. So, companies are signing contracts and spending on oversight and incentives. Secondly, on the one hand, corporate decision makers often need to obtain information from subordinates. On the other hand, the decision-making information of the upper level of the enterprise should be realized by passing it to the subordinate. The information transmission of these two different directions will be distorted by the increase of subordination of enterprise scale, resulting in the loss of enterprise efficiency. Once again, the subordinate of the enterprise often conceals or passes the wrong information to the superior for selfish motives, so that the superior can make decisions that benefit the subordinate. Or, the subordinate's decision to the superior only passes or executes the part that is advantageous to oneself. These will result in the loss of enterprise efficiency. Thus, the expansion of enterprises is limited. According to coase's theory, the scale of the enterprise should be expanded to this point, that is at this point to increase the cost of an internal exchange cost equals the cost through the market exchange cost and so on. The independent of interest is of positive significance to show the active role of the fund users in the reproduction process. But trump and republicans seem willing to take the risk. After all, by pushing the middle class to raise interest rates, they have already laid out plans for the 2018 and 2020 elections. From now on, they can boast about most family tax cuts. They are expected to peak in the run-up to the presidential election in 2019 and before the bill expires. Of the companies surveyed, 37 percent said sales rose in December, while 17 percent said sales were down. The resulting balance is + 20% below the retailer's forecast of + 30%, and below + 26% in November. Secure tokens, those little key fobs with changing passwords, has been considered what is anxiety a lot of the security concerns banks face in identifying their users. It?s still the best place and better than the usual simple password, nonetheless it?s not just a bulletproof solution that numerous people believe that it really is. With a man in the center attack, the place that the user is supplying their password as well as other important info, the attackers can clean out a forex account inside of a matter of minutes.