how does a non profit pay its employees In the early 20th century, famous American economist elvin fisher developed the theory of economic gain. In its book "the nature of capital and yield", first, the concept of yield is analyzed in terms of the performance of earnings, and three different types of benefits are proposed: Microsoft's Surface Pro, Surface Laptop, Surface Book and Surface Studio are the main products of Microsoft's Surface series, but there is a clear difference in the share of the devices. The Surface Pro products account for the highest share (79.9%), the Surface Book (7.5%), Surface Laptop (2.0%), and Surface Studio (0.2%). But in the wake of the global financial crisis, the risks of monetary and fiscal policy have been highlighted and central Banks have been given additional responsibilities. Deciding whether or not to rescue a particular financial institution, whether it guarantees system stability or other reasons, has obvious consequences for individual investors. 5. Accounting earnings depend on the reasonable proportion of income and expenses during the period. Costs that are not associated with the current period should be incurred as assets to be transferred for later periods.