a monopolist earns an economic profit only when The investment in securities is conducive to improving the operation and management of enterprises, improving the economic and social visibility of enterprises and promoting the rationalization of enterprises' behaviors. Point 3: look at the process. The trust process of p2p platform is not strict, including the borrower's identity review, professional evaluation investigation, comprehensive audit risk, mortgage notarization, etc. Subconsciously creating space to create diversity and inclusiveness - we have just entered the era of blockchain and are still working on this technology. The creators in this field are younger and mostly white men. This is not conducive to creating an attractive environment for more diverse people, and diversity is needed to develop powerful global products. Mr Draghi added that this meant that the ECB staff and its council were "cautious" in the "bold" stance of inflation. According to Jerome McCarthy, "basic marketing" : a market is a group of potential customers with the same needs; They are willing to trade the goods or services offered by the seller in exchange for something of value, which is the way to meet the demand. In the near future, the car owner who has changed the gasoline pump or unloaded the gas pump will not panic if there is a gasoline smell in the car. It is likely that the residue has not been cleaned up after the removal of the vehicle. The probability of such a situation is small, and the general replacement cycle of the gasoline pump is 100 thousand kilometers. But the gasoline filter is connected with the gasoline pump. The replacement cycle is shorter and the gasoline pump needs to be removed when replacing. In this case, simply check the installation of the gasoline pump and clean the surrounding area.