The basic economic unit of society in the primitive society of the clan, tribe, slave owners in the slave society, feudal society's family and the manual workshop, after the evolution of the form of this modern form in a capitalist society was born enterprise. Investment in securities provides an important channel for the society to raise funds, which is an effective way for enterprises to raise direct financing. 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. Because economists understand earnings as actual material wealth increase, accounting experts think the output value of more than the difference between the input value is profits, there is a contradiction and two kinds of income concept. The specific performance is: Historical costs differ from current values According to the adb's report, the global trade finance gap was as high as $1.5 trillion in 2016, while Asia accounted for 40 per cent of the gap. What the company wants to do is make up for the gap in trade finance by means of financial technology.