reconstituted net profit "Manufacturing companies with complex and lengthy international supply chains, such as the automotive industry, could also face significant challenges. These developments could also have a significant impact on productivity growth. " Western economists further point out that the main factor that leads to the difference between trading costs in markets and businesses is the incompleteness of information. Because of the incompleteness of the information. Any party of a contract will be trying to collect, information and access to what they didn't have to monitor each other's behavior, and try to constraints, and afterwards to punish in advance of each other's default behavior and so on. All these practices produce transaction costs. As a result of these practices in the market and the enterprise can take different forms, so the corresponding transaction costs is not the same, in particular, under the condition of asymmetric information, in the process of market transactions, transaction cost, as a result of these practices are often very high. Therefore, through the organizational form of enterprises, some market transactions can be internalized to eliminate or reduce the high transaction costs generated by some market exchanges. In the 1920s and 1930s, the great depression forced western economic theorists to reflect on the definition of the market. The final answer is completely laissez faire is not enough, the invisible hand sometimes does not exist, market failure, government should be on economic activity on the "total" intervention, so "macroeconomics" was born. Roosevelt also accepted Keynes's proposal to impose a "New Deal" on government intervention in the economy. It has now formed the world's most consensus-building government: fiscal policy, monetary policy, and, of course, none of these "new" policies. relied on spending cuts to reduce the deficit, adding that it should be seen as part of further measures. Michael Zezas, an analyst at Morgan Stanley, also said the tax legislation would be a boon to the market in the short term, but may not be able to make fundamental changes. The current flattening of the us Treasury yield curve shows that the medium-term slowdown in the us economy and the recession of 2019 are not going away. A tax reform would widen the fiscal deficit, possibly in the future and exacerbate cyclical risks in the economy.