what are non profit organisations Of course, for ordinary people, the yield is 3.9% or 4%, not much. But for yu 'e bao, which has 1.56 trillion yuan, the difference is significant. Historically, the concept of income has first appeared in economics. Adam Smith, in the wealth of nations, defined income as "the amount of consumption that is not eroded by capital", and saw it as an increase in wealth. Later, most economists inherited and developed this view. 1890, ai (Alfred Marshall Maarshell) in its "the principles of economics," the Adam Smith's "wealth increase" enterprise, introduced the concept of earnings, is proposed to distinguish the entity capital and value-added benefits of economic benefits. Historical costs differ from current values E CB staff predicted that the inflation rate would reach 1.4 PC by 2018, rising to 1.7 PC 2020 GDP growth of 2.3 PC next year - 0.5 percentage point upgrade - but will slow to 1.6 PC in 2020, it said. The optimal combination of benefits and risks is the best combination of benefits and risks. If the benefit is certain, the risk is minimized; Mehrotra said the additional rate for PC flash drives in 2017 is about 35 percent, and will increase to 75 percent by 2020. And "a lot of hard drives still need to be replaced by SSDS... Future self-driving vehicles are expected to be equipped with about 40GB of DRAM... This will also drive the use of NAND flash memory."